WO2024131038A1 - Multi-frequency optical local oscillator generation apparatus and method, and communication system - Google Patents

Multi-frequency optical local oscillator generation apparatus and method, and communication system Download PDF

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Publication number
WO2024131038A1
WO2024131038A1 PCT/CN2023/106971 CN2023106971W WO2024131038A1 WO 2024131038 A1 WO2024131038 A1 WO 2024131038A1 CN 2023106971 W CN2023106971 W CN 2023106971W WO 2024131038 A1 WO2024131038 A1 WO 2024131038A1
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WIPO (PCT)
Prior art keywords
signal
frequency
optical
modulator
local oscillator
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PCT/CN2023/106971
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French (fr)
Chinese (zh)
Inventor
陈文娟
段向阳
范忱
吕凯林
吴赛博
宗柏青
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中兴通讯股份有限公司
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Publication of WO2024131038A1 publication Critical patent/WO2024131038A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/70—Photonic quantum communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes

Definitions

  • the present application relates to the technical field of microwave photons, and in particular to a multi-frequency optical local oscillator generation device, method and communication system.
  • the multi-band RF transceiver of photonic technology usually needs to generate a set of highly coherent optical local oscillators in the optical domain to achieve multi-frequency conversion.
  • the limited spectrum resources allocated in the communication field are usually fragmented, for example, for a spectrum range of 40GHz, it is usually only necessary to process a few narrowband frequency points such as 2.6GHz, 3.5GHz, 4.9GHz, 28GHz, 39GHz, etc.
  • the commonly used method of photonic technology is to use a set of optical frequency combs as multi-frequency optical local oscillators.
  • the corresponding multi-frequency optical local oscillators are a set of frequencies arranged in an equidistant manner. Therefore, a set of optical frequency combs with extremely small comb tooth spacing (MHz level) and a large number of comb teeth (hundreds) is required to cover all fragmented spectrum ranges. This puts forward relatively stringent requirements on the generation of optical frequency combs. Not only is the cost high, but a large number of local oscillator comb tooth resources are idle, so the spectrum utilization rate is low.
  • the embodiments of the present application provide a multi-frequency optical local oscillator generation device, method and communication system, aiming to reduce the cost of generating multi-frequency optical local oscillators and improve spectrum utilization.
  • an embodiment of the present application provides a multi-frequency optical local oscillator generating device, comprising: a carrier modulation
  • a control module includes an in-phase orthogonal IQ modulator, which is used to connect to a laser source to perform orthogonal modulation on an optical carrier output by the laser source to obtain a modulated optical signal; an optoelectronic conversion module, which is connected to the carrier modulation module and is used to convert the modulated optical signal into an electrical signal; and an RF configuration module, which is connected to the optoelectronic conversion module and is used to configure the electrical signal into a plurality of RF signals of preset frequencies; wherein the IQ modulator is also connected to the RF configuration module, and the IQ modulator is also used to couple the plurality of RF signals with the optical carrier respectively to obtain a multi-frequency optical local oscillator signal.
  • an embodiment of the present application further provides a multi-frequency optical local oscillator generation method, which is applied to a multi-frequency optical local oscillator generation device, wherein the multi-frequency optical local oscillator generation device includes a carrier modulation module, an optoelectronic conversion module and a radio frequency configuration module; wherein the carrier modulation module includes an in-phase orthogonal IQ modulator, and the IQ modulator is used to connect a laser source; the optoelectronic conversion module is connected to the carrier modulation module, the radio frequency configuration module is connected to the optoelectronic conversion module, and the IQ modulator is also connected to the radio frequency configuration module; the method includes: orthogonally modulating the optical carrier output by the laser source through the IQ modulator to obtain a modulated optical signal; converting the modulated optical signal into an electrical signal through the optoelectronic conversion module; configuring the electrical signal into a plurality of radio frequency signals of preset frequencies through the radio frequency configuration module; and coupling the plurality of
  • an embodiment of the present application further provides a communication system, which includes a transmitting link and a receiving link; and any multi-frequency optical local oscillator generating device provided in an embodiment of the present application, which is used to provide a multi-frequency optical local oscillator signal for the transmitting link and the receiving link.
  • FIG1 is a schematic block diagram of the structure of a multi-frequency optical local oscillator generating device provided in an embodiment of the present application;
  • FIG2 is a schematic block diagram of the structure of another multi-frequency optical local oscillator generating device provided in an embodiment of the present application;
  • FIG3 is a schematic block diagram of the structure of another multi-frequency optical local oscillator generating device provided in an embodiment of the present application.
  • FIG4 is a schematic block diagram of the structure of another multi-frequency optical local oscillator generating device provided in an embodiment of the present application.
  • FIG. 5 is a schematic diagram of the structure of another multi-frequency optical local oscillator generating device provided in an embodiment of the present application. picture;
  • FIG6 is a schematic block diagram of the structure of another multi-frequency optical local oscillator generating device provided in an embodiment of the present application.
  • FIG7 is a schematic block diagram of the structure of another multi-frequency optical local oscillator generating device provided in an embodiment of the present application.
  • FIG8 is a schematic diagram of a step flow chart of a method for generating a multi-frequency optical local oscillator provided in an embodiment of the present application
  • FIG9 is a schematic block diagram of the structure of a communication system provided in an embodiment of the present application.
  • FIG10 is a schematic block diagram of the structure of another communication system provided in an embodiment of the present application.
  • FIG. 11 is a schematic block diagram of the structure of another communication system provided in an embodiment of the present application.
  • FIG. 1 is a schematic block diagram of a multi-frequency optical local oscillator generating device provided in an embodiment of the present application.
  • the multi-frequency optical local oscillator generating device 100 includes a carrier modulation module 110, an optoelectronic conversion module 120, and a radio frequency configuration module 130.
  • the multi-frequency optical local oscillator generating device 100 is connected to a laser source 10, and the laser source 10 is used to output an optical carrier.
  • the optical carrier output by 10 generates a multi-frequency optical local oscillator signal.
  • the carrier modulation module 110 includes an in-phase orthogonal IQ modulator, which is used to connect to the laser source 10 to perform orthogonal modulation on the optical carrier output by the laser source 10 to obtain a modulated optical signal.
  • the photoelectric conversion module 120 is connected to the carrier modulation module 110 and is used to convert the modulated optical signal into an electrical signal.
  • the radio frequency configuration module 130 is connected to the photoelectric conversion module 120 and is used to configure the electrical signal into a plurality of radio frequency signals of preset frequencies.
  • the IQ modulator is also connected to the radio frequency configuration module 130, and the IQ modulator is also used to couple the plurality of radio frequency signals with the optical carrier respectively to obtain a multi-frequency optical local oscillator signal.
  • the laser source 10 can be a single-wavelength light source
  • the optical carrier can be a single-wavelength optical signal.
  • the IQ modulator can be a Mach-Zehnder modulator
  • the optoelectronic conversion module 120 can perform optoelectronic conversion on the modulated optical signal to obtain an electrical signal
  • the RF configuration module 130 configures the electrical signal obtained by the optoelectronic conversion into a plurality of RF signals of preset frequencies, and the preset frequencies of the plurality of RF signals can be the same or different
  • the RF configuration module 130 can couple the RF signals of the same or different preset frequencies with the optical carrier respectively, so as to modulate the plurality of RF signals on the left and right sides of the optical carrier to obtain a multi-frequency optical local oscillator signal.
  • the multi-frequency optical local oscillator signal can be two or more optical local oscillator signals, without the need to use expensive optical frequency combs or multiple groups of optoelectronic oscillators, effectively reducing the cost of generating multi-frequency optical local oscillators and improving spectrum utilization.
  • the carrier modulation module 110 includes an IQ modulator 111, and the IQ modulator 111 includes two components, an I arm and a Q arm.
  • the optical carrier is divided into two paths for carrier modulation through the I arm and the Q arm in the IQ modulator 111.
  • the two optical carriers are orthogonal to each other, that is, two optical carriers with the same frequency and a phase difference of 90 degrees are modulated separately and then transmitted together, thereby realizing sideband multiplexing of the local oscillator frequency of the optical carrier, which can improve spectrum utilization.
  • the carrier modulation module 110 further includes a single-mode optical fiber 112; the single-mode optical fiber 112 is connected to the IQ modulator 111, and is used to delay the modulated optical signal output by the IQ modulator 111. It should be noted that the modulated optical signal is delayed by the single-mode optical fiber 112 to obtain a delayed modulated optical signal, and the delayed modulated optical signal is used to complete the closed loop after being input to the optoelectronic conversion module 120 and passing through the RF configuration module 130, so that the closed loop stability can be improved.
  • the multi-frequency optical local oscillator signal can be output after being delayed by the single-mode optical fiber 112, or it can be output directly without being delayed by the single-mode optical fiber 112.
  • the embodiment of the present application does not make any specific limitation on this.
  • the photoelectric conversion module 120 includes a photodetector 121 and an amplifier 122; the photodetector 121 is connected to the carrier modulation module 110 to modulate the optical signal The amplifier 122 is connected to the photodetector 121 to amplify the electrical signal.
  • the photoelectric conversion module 120 may be one-way or multi-way, and the multi-way photoelectric conversion module 120 may include multiple groups of photodetectors 121 and multiple groups of amplifiers 122. The specific number of paths of the photoelectric conversion module 120 may be determined according to actual conditions. In some embodiments, the photoelectric conversion module 120 may also only include a photodetector for converting a modulated optical signal into an electrical signal, which is not specifically limited in this embodiment.
  • the RF configuration module 130 includes a power divider 131 and a first filter group 132; the power divider 131 is connected to the photoelectric conversion module 120 and is used to distribute power to the electrical signal; the first filter group 132 is connected to the power divider 131, and the first filter group 132 is used to perform frequency selection on the electrical signal to obtain a plurality of RF signals of preset frequencies.
  • the preset frequency can be a plurality of pre-set frequencies, such as F1, F2, etc.
  • the power distribution can be an average power distribution, thereby improving the stability of the system.
  • the first filter group 132 may include a plurality of electrical filters, and the power divider 131 can perform power equalization on the electrical signal according to the number of the plurality of electrical filters, and each electrical filter performs frequency selection on the electrical signal after power distribution based on the preset frequency set by each electrical filter, and obtains the RF signal of the preset frequency corresponding to each electrical filter.
  • the first filter group 132 includes a first electrical filter 1321 and a second electrical filter 1322, and the first electrical filter 1321 and the second electrical filter 1322 are connected to the power divider; the first electrical filter 1321 is used to perform frequency selection on the electrical signal according to the first preset frequency to obtain a first radio frequency signal; the second electrical filter 1322 is used to perform frequency selection on the electrical signal according to the second preset frequency to obtain a second radio frequency signal; the first electrical filter 1321 and the second electrical filter 1322 are also connected to the controlled end of the IQ modulator 111, and the IQ modulator 111 is also used to couple the first radio frequency signal and the second radio frequency signal to both sides of the sideband of the optical carrier respectively to obtain a two-frequency optical local oscillator signal.
  • the first electrical filter 1321 and the second electrical filter 1322 can be adjustable electrical filters, the first preset frequency and the second preset frequency can be set according to actual conditions, the frequency of the first RF signal obtained by frequency selection by the first electrical filter 1321 can be the first preset frequency, and the frequency of the second RF signal obtained by frequency selection by the second electrical filter 1322 can be the second preset frequency, and the IQ modulator 111 can couple the first RF signal and the second RF signal to both sides of the sideband of the optical carrier respectively, thereby realizing side-channel multiplexing of the optical carrier and improving spectrum utilization.
  • the first radio frequency signal obtained by the first electrical filter 1321 through frequency selection is The second radio frequency signal obtained by the second electrical filter 1322 through frequency selection is:
  • the IQ modulator 111 is made to work in the single sideband modulation format, so that the modulation
  • the first RF signal in the I arm Will appear on the carrier frequency
  • the left side (or right side) of the Q arm is modulated by a second RF signal Will appear on the carrier frequency
  • the RF signals output by the first electric filter and the second electric filter will respectively drive the I arm and Q arm of the IQ modulator 111 for orthogonal modulation, thereby obtaining two optical local oscillator signals.
  • the RF configuration module 130 can also be one channel.
  • the RF configuration module 130 can also be multi-channel.
  • the first filter group 132 can include other electrical filters besides the first electrical filter and the second electrical filter, for example, also including a third electrical filter.
  • the first filter group 132 can be multiple groups, and the number of multiple electrical filters in each group of the first filter group 132 can be equal or unequal, that is, the multi-channel RF configuration modules 130 can all include at least one group of the first filter group 132.
  • the carrier modulation module 110 further includes a coupler.
  • the coupler is connected to multiple IQ modulators and is used to couple the modulated optical signals output by the multiple IQ modulators.
  • the carrier modulation module 110 further includes a coupler 113 connected to the two IQ modulators 111. It should be noted that the modulated optical signals output by the two IQ modulators 111 are coupled by the coupler 113 to obtain a coupled modulated optical signal.
  • the coupler 113 is also used to output the coupled modulated optical signal to the photoelectric conversion module 120.
  • the photoelectric conversion module 120 includes a photodetector 121 and an amplifier 122.
  • the photodetector 121 is connected to the coupler 113, and is used to convert the coupled modulated optical signal into an electrical signal;
  • the amplifier 122 is connected to the photodetector 121, and is used to amplify the electrical signal.
  • the radio frequency configuration module 130 includes a power divider 131 and two electrical filter groups; the power divider 131 is connected to the amplifier 122, and is used to distribute the power of the amplified electrical signal; one of the electrical filter groups includes a first electrical filter 1321 and a second electrical filter 1322, and the other electrical filter group includes a third electrical filter 1323 and a fourth electrical filter 1324, and the first electrical filter 1321, the second electrical filter 1322, the third electrical filter 1323, and the fourth electrical filter 1324 are all connected to the power divider 131.
  • the first electrical filter 1321 is used to perform frequency selection on the electrical signal according to a first preset frequency to obtain a first radio frequency signal
  • the second electric filter 1322 is used to select the frequency of the electric signal according to the second preset frequency to obtain a second radio frequency signal
  • the first electric filter 1321 and the second electric filter 1322 are also connected to a controlled end of an IQ modulator 111.
  • the IQ modulator 111 is also used to convert the first radio frequency signal With the second RF signal Coupled to the optical carrier On both sides of the sideband, two-frequency optical local oscillator signals are obtained
  • the third electric filter 1323 is used to perform frequency selection on the electric signal according to the third preset frequency to obtain a third radio frequency signal
  • the fourth electric filter 1324 is used to select the frequency of the electric signal according to the fourth preset frequency to obtain a fourth radio frequency signal
  • the third electric filter 1323 and the fourth electric filter 1324 are also connected to the controlled end of another IQ modulator 111, and the other IQ modulator 111 is also used to convert the third RF signal With the fourth radio frequency signal Coupled to the optical carrier On both sides of the sideband, two-frequency optical local oscillator signals are obtained
  • the optoelectronic conversion module 120 includes a beam splitter 123, multiple photodetectors 121 and multiple amplifiers 122; the beam splitter 123 is connected to the coupler 113, and is used to divide the coupled modulated optical signal into multiple sub-modulated optical signals, and output the multiple sub-modulated optical signals to multiple photodetectors respectively; each photodetector 121 is connected to the beam splitter 123, and the photodetector 121 is used to convert the sub-modulated optical signal into a sub-electrical signal; each amplifier 122 is connected to the multiple photodetectors 121 in a one-to-one correspondence, and the amplifier 122 is used to amplify the sub-electrical signal; each amplifier 122 is also connected to the multiple RF configuration modules 130 in a one-to-one correspondence, and the RF configuration module 130 is used to configure the amplified sub-electrical signal into a RF signal of a preset frequency.
  • the RF configuration module 130 includes two power dividers 131 and two electric filter groups; both power dividers 131 are connected to the amplifier 122 to distribute the power of the amplified sub-electrical signals; one of the electric filter groups includes a first electric filter 1321 and a second electric filter 1322, and the other electric filter group includes a third electric filter 1323 and a fourth electric filter 1324, the first electric filter 1321 and the second electric filter 1322 are connected to one of the power dividers 131, and the third electric filter 1323 and the fourth electric filter 1324 are connected to the other power divider 131.
  • the IQ modulator 111 is also used to convert the first radio frequency signal With the second RF signal Coupled to the optical carrier On both sides of the sideband, two-frequency optical local oscillator signals are obtained
  • the third electrical filter 1323 is used to select the frequency of the sub-electrical signal according to the third preset frequency to obtain a third radio frequency signal
  • the fourth electrical filter 1324 is used to perform frequency selection on the sub-electrical signal according to the fourth preset frequency to obtain a fourth radio frequency signal
  • the third electric filter 1323 and the fourth electric filter 1324 are also connected to the controlled end of another IQ modulator 111, and the other IQ modulator 111 is also used to convert the third RF signal With the fourth radio frequency signal Coupled to the optical carrier On both sides of the sideband, two-frequency optical local oscillator signals are obtained
  • the IQ modulator 111 includes a first IQ modulator 1111 and a second IQ modulator 1112
  • the carrier modulation module 110 also includes a first polarization beam splitter 1141 and a first Polarization beam combiner 1142
  • the first polarization beam splitter 1141 is connected to the laser source 10, and is used to split the optical carrier into a first polarization state signal and a second polarization state signal
  • the first IQ modulator 1111 is connected to the first polarization beam splitter 1141, and is used to orthogonally modulate the first polarization state signal to obtain a first modulated optical signal
  • the second IQ modulator 1112 is connected to the first polarization beam splitter 1141, and is used to orthogonally modulate the second polarization state signal to obtain a second modulated optical signal
  • the polarization beam combiner 1142 is connected to the first IQ modulator 1111 and the second IQ modulator 1112, and is used to combine the first modulated optical signal and the
  • the photoelectric conversion module 120 includes a first polarization controller 1241, a second polarization beam splitter 1242, a first photoelectric conversion unit 1201, and a second photoelectric conversion unit 1202; the first polarization controller 1241 is connected to the first polarization beam combiner 1142, and the first polarization controller 1241 is used to control the second polarization beam splitter 1242 according to the polarization state angle of the first polarization beam splitter 1141, so that the polarization state angle of the second polarization beam splitter 1242 and the first polarization beam splitter 1141 remain the same; the second polarization beam splitter 1242 is connected to the first polarization controller 1241, and the second polarization beam splitter 1242 is connected to the first polarization controller 1241.
  • the polarization beam splitter 1242 is used to split the modulated optical signal into a third polarization state signal and a fourth polarization state signal; the first photoelectric conversion unit 1201 and the second photoelectric conversion unit 1202 are connected to the second polarization beam splitter 1242, the first photoelectric conversion unit 1201 is used to convert the third polarization state signal into a first electrical signal, and the second photoelectric conversion unit 1202 is used to convert the fourth polarization state signal into a second electrical signal; the first photoelectric conversion unit 1201 and the second photoelectric conversion unit 1202 are also connected to the radio frequency configuration module 130, and the radio frequency configuration module 130 is used to configure the first electrical signal and the second electrical signal into two radio frequency signals of preset frequencies, respectively.
  • the first photoelectric conversion unit 1201 and the second photoelectric conversion unit 1202 respectively include a photodetector 121 and an amplifier 122.
  • the photodetector 121 is connected to the second polarization beam splitter 1242, and is used to convert the third polarization state signal or the fourth polarization state signal into an electrical signal;
  • the amplifier 122 is connected to the photodetector 121, and is used to amplify the electrical signal.
  • the first electric filter 1321 is used to select the frequency of the electric signal according to the first preset frequency to obtain a first radio frequency signal
  • the second electric filter 1322 is used to select the frequency of the electric signal according to the second preset frequency to obtain a second radio frequency signal
  • the first electric filter 1321 and the second electric filter 1322 are also connected to an IQ modulator 111
  • the IQ modulator 111 is also used to convert the first radio frequency signal With the second RF signal Coupled to the optical carrier On both sides of the sideband in the X polarization state, the two-frequency optical local oscillator signal in the X polarization state is obtained.
  • the third electric filter 1323 is used to select the frequency of the electric signal according to the third preset frequency to obtain a third radio frequency signal
  • the fourth electric filter 1324 is used to select the frequency of the electric signal according to the fourth preset frequency to obtain a fourth radio frequency signal
  • the third electric filter 1323 and the fourth electric filter 1324 are also connected to the controlled end of another IQ modulator 111, and the other IQ modulator 111 is also used to convert the third RF signal With the fourth radio frequency signal Coupled to the optical carrier On both sides of the sideband on the Y polarization state, the two-frequency optical local oscillator signal on the Y polarization state is obtained.
  • the input optical carrier forms independent oscillation loops in two orthogonal polarization states, and then uses the sideband multiplexing of the IQ modulator in each polarization state to form two independent oscillation loops in the upper and lower optical sidebands.
  • one IQ modulator can be used to generate four independent optoelectronic oscillator loops to obtain four independent optical local oscillator signals.
  • Each optical local oscillator signal can achieve independent frequency tuning by relying on the electrical filter in its own loop.
  • the embodiments of the present application aim to overcome the shortcomings of the existing multi-frequency optical local oscillator implementation methods, such as high cost and large waste of spectral resources, and provide a multi-frequency optical local oscillator generation solution based on sideband multiplexing and polarization multiplexing.
  • the solution can realize the simultaneous generation of four independent coherent optical local oscillator signals with adjustable frequencies on a single path through multiplexing. This not only realizes the flexible reconfiguration of optical local oscillator signals within a wide spectrum range, but also improves the spectrum utilization in a cost-effective manner.
  • This solution has obvious advantages over traditional optoelectronic oscillators that can usually only generate one oscillation frequency on one path.
  • the multi-frequency optical local oscillator generating device 100 includes a carrier modulation module 110, an optoelectronic conversion module 120 and a radio frequency configuration module 130; wherein the carrier modulation module 110 includes an in-phase orthogonal IQ modulator 111, and the IQ modulator 111 is used to connect to the laser source 10 to perform orthogonal modulation on the optical carrier output by the laser source 10 to obtain a modulated optical signal; the optoelectronic conversion module 120 is connected to the carrier modulation module 110, and is used to convert the modulated optical signal into an electrical signal; the radio frequency configuration module 130 is connected to the optoelectronic conversion module 120, and is used to configure the electrical signal into a plurality of radio frequency signals of preset frequencies; the IQ modulator 111 is also connected to the radio frequency configuration module 130, and the IQ modulator 111 is also used to couple the plurality of radio frequency signals with the optical carrier respectively to obtain a multi-frequency optical local oscillator signal.
  • the embodiment of the present application couples the plurality of radio frequency signals of preset frequencies with the optical carrier respectively through the IQ modulator 111, thereby realizing the sideband multiplexing of the local oscillator frequency, and can obtain optical local oscillator signals of multiple frequency bands in a cost-effective manner, effectively reducing the generation of multi-frequency optical local oscillator signals.
  • the cost of the local oscillator can be reduced and the spectrum utilization can be improved.
  • FIG. 8 is a schematic flow chart of the steps of a method for generating a multi-frequency optical local oscillator provided in an embodiment of the present application.
  • the multi-frequency optical local oscillator generation method can be applied to a multi-frequency optical local oscillator generation device, which includes a carrier modulation module, an optoelectronic conversion module, and a radio frequency configuration module; wherein the carrier modulation module includes an in-phase orthogonal IQ modulator, and the IQ modulator is used to connect to a laser source; the optoelectronic conversion module is connected to the carrier modulation module, the radio frequency configuration module is connected to the optoelectronic conversion module, and the IQ modulator is also connected to the radio frequency configuration module.
  • the multi-frequency optical local oscillator generation device can refer to the multi-frequency optical local oscillator generation device in Figures 1 to 7 above.
  • the multi-frequency optical local oscillator generation method includes steps S201 to S204.
  • steps S201 to S204 The following is a detailed description:
  • Step S201 quadrature modulate the optical carrier output by the laser source through an IQ modulator to obtain a modulated optical signal.
  • the laser source may be a single-wavelength light source
  • the optical carrier may be a single-wavelength optical signal.
  • the IQ modulator may be a Mach-Zehnder modulator.
  • the IQ modulator 111 includes two components, an I arm and a Q arm.
  • the optical carrier is divided into two paths for carrier modulation through the I arm and the Q arm in the IQ modulator 111.
  • the two paths of optical carriers are orthogonal to each other, that is, the two paths of optical carriers with the same frequency and a phase difference of 90 degrees are modulated separately and then transmitted together to obtain a modulated optical signal.
  • the carrier modulation module further includes a single-mode optical fiber; the single-mode optical fiber is connected to the IQ modulator and is used to delay the modulated optical signal output by the IQ modulator. It should be noted that the modulated optical signal is delayed by the single-mode optical fiber to obtain a delayed modulated optical signal, and the delayed modulated optical signal is used to complete the closed loop after being input into the optoelectronic conversion module and then passed through the RF configuration module, so that the closed loop stability can be improved.
  • the carrier modulation module further includes a coupler.
  • the coupler is connected to the multiple IQ modulators and is used to couple the modulated optical signals output by the multiple IQ modulators.
  • the IQ modulator includes a first IQ modulator and a second IQ modulator
  • the carrier modulation module also includes a first polarization beam splitter and a first polarization beam combiner;
  • the first polarization beam splitter is connected to the laser source and is used to split the optical carrier into a first polarization state signal and a second polarization state signal;
  • the first IQ modulator is connected to the first polarization beam splitter and is used to orthogonally modulate the first polarization state signal to obtain a first modulated optical signal;
  • the second IQ modulator is connected to the first polarization beam splitter and is used to orthogonally modulate the second polarization state signal to obtain a first modulated optical signal.
  • the first IQ modulator and the second IQ modulator are connected to the polarization combiner for combining the first modulated optical signal and the second modulated optical signal to obtain a modulated optical signal, which is a polarization multiplexed optical signal.
  • Step S202 convert the modulated optical signal into an electrical signal through a photoelectric conversion module.
  • the photoelectric conversion module includes a photodetector and an amplifier; the photodetector is connected to the carrier modulation module to convert the modulated optical signal into an electrical signal; the amplifier is connected to the photodetector to amplify the electrical signal.
  • the photoelectric conversion module can be one-way or multi-way, and the multi-way photoelectric conversion module can include multiple groups of photodetectors and multiple groups of amplifiers. The specific number of channels of the photoelectric conversion module can be determined according to actual conditions.
  • the photoelectric conversion module may also only include a photodetector for converting the modulated optical signal into an electrical signal, and this embodiment does not specifically limit this.
  • the photodetector in the photoelectric conversion module is connected to the coupler to convert the coupled modulated optical signal into an electrical signal; and the amplifier is connected to the photodetector to amplify the electrical signal.
  • the optoelectronic conversion module includes a beam splitter, multiple photodetectors and multiple amplifiers; the beam splitter is connected to the coupler, and is used to divide the coupled modulated optical signal into multiple sub-modulated optical signals, and output the multiple sub-modulated optical signals to multiple photodetectors respectively; each photodetector is connected to the beam splitter, and the photodetector is used to convert the sub-modulated optical signal into a sub-electrical signal; each amplifier is connected to the multiple photodetectors in a one-to-one correspondence, and the amplifier is used to amplify the sub-electrical signal; each amplifier is also connected to multiple RF configuration modules in a one-to-one correspondence, and the RF configuration module is used to configure the amplified sub-electrical signal into an RF signal of a preset frequency.
  • the photoelectric conversion module may include a first polarization controller, a second polarization beam splitter, a first photoelectric conversion unit and a second photoelectric conversion unit;
  • the first polarization controller is connected to the first polarization beam combiner, and the first polarization controller is used to control the second polarization beam splitter according to the polarization state angle of the first polarization beam splitter, so that the polarization state angle of the second polarization beam splitter and the first polarization beam splitter remain the same;
  • the second polarization beam splitter is connected to the first polarization controller, and the second polarization beam splitter is used to divide the modulated optical signal into a third polarization state signal and a fourth polarization state signal;
  • the first photoelectric conversion unit and the second photoelectric conversion unit are connected to the second polarization beam splitter, the first photoelectric conversion unit is used to convert the third polarization state signal into a first electrical
  • Step S203 configuring the electrical signal into radio frequency signals of multiple preset frequencies through a radio frequency configuration module.
  • the RF configuration module configures the electrical signal obtained by photoelectric conversion into a plurality of RF signals of preset frequencies, and the preset frequencies of the plurality of RF signals may be the same or different.
  • the RF configuration module may also output RF signals of the same or different preset frequencies to the IQ modulator.
  • the RF configuration module includes a power divider and a first filter group; the power divider is connected to the photoelectric conversion module and is used to distribute the power of the electrical signal; the first filter group is connected to the power divider, and the first filter group is used to select the frequency of the electrical signal to obtain RF signals of multiple preset frequencies.
  • the preset frequency may be a plurality of pre-set frequencies, such as F1, F2, etc., and the power distribution may be an average power distribution, thereby improving the stability of the system.
  • the first filter group may include a plurality of electrical filters
  • the power divider may perform power equalization on the electrical signal according to the number of the plurality of electrical filters
  • each electrical filter performs frequency selection on the electrical signal after power distribution based on the preset frequency set by each electrical filter, thereby obtaining a radio frequency signal of the preset frequency corresponding to each electrical filter.
  • the first filter group includes a first electrical filter and a second electrical filter, and the first electrical filter and the second electrical filter are connected to a power divider; the first electrical filter is used to perform frequency selection on the electrical signal according to a first preset frequency to obtain a first radio frequency signal; the second electrical filter is used to perform frequency selection on the electrical signal according to a second preset frequency to obtain a second radio frequency signal; the first electrical filter and the second electrical filter are also connected to a controlled end of an IQ modulator, and the IQ modulator is also used to couple the first radio frequency signal and the second radio frequency signal to both sides of the sideband of the optical carrier, respectively, to obtain a two-frequency optical local oscillator signal.
  • the first electrical filter and the second electrical filter can be adjustable electrical filters, the first preset frequency and the second preset frequency can be set according to actual conditions, the frequency of the first RF signal obtained by frequency selection by the first electrical filter can be the first preset frequency, and the frequency of the second RF signal obtained by frequency selection by the second electrical filter can be the second preset frequency.
  • the IQ modulator can couple the first RF signal and the second RF signal to both sides of the sideband of the optical carrier respectively, thereby realizing side-channel multiplexing of the optical carrier and improving spectrum utilization.
  • the RF configuration module when the IQ modulator includes a first IQ modulator and a second IQ modulator, includes a power divider and two electric filter groups; the power divider is connected to the amplifier and is used to distribute the power of the amplified electric signal; one of the electric filter groups includes a first electric filter and a second electric filter, and the other electric filter group includes a third electric filter and a fourth electric filter, and the first electric filter, the second electric filter, the third electric filter, and the fourth electric filter are all connected to the power divider.
  • An electric filter is used to select the frequency of the electric signal according to the first preset frequency to obtain a first radio frequency signal
  • the second electric filter is used to select the frequency of the electric signal according to the second preset frequency to obtain a second radio frequency signal
  • the third electric filter is used to perform frequency selection on the electric signal according to the third preset frequency to obtain a third radio frequency signal
  • the fourth electric filter is used to select the frequency of the electric signal according to the fourth preset frequency to obtain a fourth radio frequency signal
  • Step S204 multiple radio frequency signals are coupled to the optical carrier through an IQ modulator to obtain multi-frequency optical local oscillator signals.
  • RF signals of the same or different preset frequencies can be coupled to the optical carrier respectively, so that multiple RF signals are modulated on the left and right sides of the optical carrier to obtain a multi-frequency optical local oscillator signal.
  • the multi-frequency optical local oscillator signal can be two or more optical local oscillator signals, without the need to use expensive optical frequency combs or multiple groups of optoelectronic oscillators, effectively reducing the cost of generating multi-frequency optical local oscillators and improving spectrum utilization.
  • the first radio frequency signal obtained by the first electrical filter through frequency selection is:
  • the second radio frequency signal obtained by the second electric filter through frequency selection is:
  • the RF configuration module includes, for example, two electric filter groups, one of which includes a first electric filter and a second electric filter, and the other electric filter group includes a third electric filter and a fourth electric filter.
  • the first electric filter is used to perform frequency selection on the sub-electrical signal according to the first preset frequency to obtain the first RF signal
  • the second electric filter is used to select the frequency of the sub-electrical signal according to the second preset frequency to obtain a second radio frequency signal
  • the first electric filter and the second electric filter are also connected to a controlled end of an IQ modulator, and the IQ modulator is also used to convert the first radio frequency signal With the second RF signal Coupled to the optical carrier On both sides of the sideband, two-frequency optical local oscillator signals are obtained
  • the third electric filter is used to select the frequency of the sub-electrical signal according to the third preset frequency to obtain a third radio frequency signal
  • the fourth electric filter is used to select the frequency of the sub-electrical signal according to the fourth preset frequency to obtain a fourth radio frequency signal
  • the third electric filter and the fourth electric filter are also connected to the controlled end of another IQ modulator, and the other IQ modulator is also used to convert the third radio frequency signal With the fourth radio frequency signal
  • the RF configuration module when the IQ modulator includes a first IQ modulator and a second IQ modulator, includes a power divider and two electrical filter groups; the power divider is connected to the amplifier and is used to distribute the power of the amplified electrical signal; one of the electrical filter groups includes a first electrical filter and a second electrical filter, and the other electrical filter group 132 includes a third electrical filter and a fourth electrical filter, and the first electrical filter, the second electrical filter, the third electrical filter, and the fourth electrical filter are all connected to the power divider.
  • the first electrical filter is used to select the frequency of the electrical signal according to the first preset frequency to obtain a first RF signal
  • the second electric filter is used to select the frequency of the electric signal according to the second preset frequency to obtain a second radio frequency signal
  • the first electric filter and the second electric filter are also connected to a controlled end of an IQ modulator, and the IQ modulator is also used to convert the first radio frequency signal With the second RF signal Coupled to the optical carrier On both sides of the sideband in the X polarization state, the two-frequency optical local oscillator signal in the X polarization state is obtained.
  • the third electric filter is used to perform frequency selection on the electric signal according to the third preset frequency to obtain a third radio frequency signal
  • the fourth electric filter is used to select the frequency of the electric signal according to the fourth preset frequency to obtain a fourth radio frequency signal
  • the third electric filter and the fourth electric filter are also connected to the controlled end of another IQ modulator, and the other IQ modulator is also used to convert the third radio frequency signal With the fourth radio frequency signal Coupled to the optical carrier On both sides of the sideband on the Y polarization state, the two-frequency optical local oscillator signal on the Y polarization state is obtained.
  • the multi-frequency optical local oscillator generation method provided in the above embodiment is to orthogonally modulate the optical carrier output by the laser source through an IQ modulator to obtain a modulated optical signal; convert the modulated optical signal into an electrical signal through an optoelectronic conversion module; configure the electrical signal into a plurality of RF signals of preset frequencies through an RF configuration module; and couple the plurality of RF signals with the optical carrier respectively through an IQ modulator to obtain a multi-frequency optical local oscillator signal.
  • the embodiment of the present application couples the RF signals of multiple preset frequencies with the optical carrier respectively through an IQ modulator, thereby realizing the sideband multiplexing of the local oscillator frequency, and can obtain multi-band optical local oscillator signals in a cost-effective manner, effectively reducing the cost of generating a multi-frequency optical local oscillator and improving the spectrum utilization.
  • FIG. 9 is a schematic block diagram of the structure of a communication system provided in an embodiment of the present application.
  • the communication system 300 includes a transmission link 310, a receiving link 320, and a multi-frequency optical local oscillator generating device 330.
  • the multi-frequency optical local oscillator generating device 330 is used to generate the transmission link 310 and the receiving link 320.
  • the transmission link 310 and the receiving link 320 provide a multi-frequency optical local oscillator signal.
  • the multi-frequency optical local oscillator generating device 330 can be connected to the transmission link 310 and the receiving link 320 respectively to send the multi-frequency optical local oscillator signal to the transmission link 310 and the receiving link 320 respectively.
  • the multi-frequency optical local oscillator generating device 330 can be the multi-frequency optical local oscillator generating device 100 in Figures 1 to 7 of the aforementioned embodiments.
  • the transmitting link 310 and the receiving link 320 can share the multi-frequency optical local oscillator generating device 330, so that multi-band microwave photonic communication can be realized conveniently and quickly, that is, multi-band radio frequency signals are sent outwardly through the transmitting link 310, or multi-band target baseband data signals are received through the receiving link 320.
  • the transmission link 310 includes a transmitting end IQ modulator 311, a second filter group 312 and a first photodetector group 313;
  • the transmitting end IQ modulator 311 is used to connect to the laser source 10, and is also used to receive a baseband data signal, so as to modulate the baseband data signal on the optical carrier output by the laser source 10 to obtain a baseband modulation signal;
  • the multi-frequency optical local oscillator signal provided by the multi-frequency optical local oscillator generating device 330 is used to couple with the baseband modulation signal to obtain a multi-frequency baseband coupled signal;
  • the second filter group 312 is connected to the transmitting end IQ modulator 311 and the multi-frequency optical local oscillator generating device 330, and the second filter group 312 is used to filter the multi-frequency baseband coupled signal;
  • the first photodetector group 313 is connected to the second filter group 312, and is used to perform heterodyne processing on the filtered multi-frequency baseband
  • the transmission link 310 also includes a second polarization controller 3141 and a third polarization beam splitter 3142; the output end of the second polarization controller 3141 is connected to the transmitting end IQ modulator 311 and the multi-frequency optical local oscillator generating device 330, and the second polarization controller 3141 is used to control the third polarization beam splitter 3142 according to the polarization state angle of the first polarization beam splitter 1141 or the second polarization beam splitter 1242 in the multi-frequency optical local oscillator generating device 330, so that the polarization state angle of the third polarization beam splitter 3142 remains the same as that of the first polarization beam splitter 1141 or the second polarization beam splitter 1242; the third polarization beam splitter 3142 is connected to the second polarization controller 3141, and the third polarization beam splitter 3142 is used to separate the polarization state signal of the multi-frequency baseband coupling signal, and input the
  • the second filter group 312 includes an optical filter 3121, an optical filter 3122, an optical filter 3123, and an optical filter 3124
  • the first photodetector group 313 includes a photodetector 3131, a photodetector 3132, a photodetector 3133, and a photodetector 3134.
  • the optical filter 3121 is connected to the photodetector 3131, the optical filter 3121 is used to filter the separated baseband coupling signal according to the first preset frequency, and the photodetector 3131 is used to convert the filtered baseband coupling signal into The optical signal is output to obtain the RF signal
  • the optical filter 3122 is connected to the photodetector 3132.
  • the optical filter 3122 is used to filter the separated baseband coupling signal according to the second preset frequency.
  • the photodetector 3132 is used to convert the filtered baseband coupling signal into an optical signal for output to obtain a radio frequency signal.
  • the optical filter 3123 is connected to the photodetector 3133.
  • the optical filter 3123 is used to filter the separated baseband coupling signal according to the third preset frequency.
  • the photodetector 3133 is used to convert the filtered baseband coupling signal into an optical signal for output to obtain a radio frequency signal.
  • the optical filter 3124 is connected to the photodetector 3134, and the optical filter 3124 is used to filter the separated baseband coupling signal according to the fourth preset frequency, and the photodetector 3134 is used to convert the filtered baseband coupling signal into an optical signal for output to obtain a radio frequency signal.
  • the optical carrier generated by the laser source The baseband data signal generated by the digital-to-analog converter is modulated by a transmitter IQ modulator (MZM).
  • MZM transmitter IQ modulator
  • the modulated baseband signal is then coupled with the optical local oscillator signal generated by the multi-frequency optical local oscillator module and transmitted to the remote polarization controller.
  • the polarization controller is adjusted to separate the two orthogonal polarization states X and Y at the two output ends of the polarization beam splitter.
  • the output optical signal includes the optical local oscillators ( and ) and a modulated optical carrier
  • the baseband signal on the optical fiber is filtered by two optical filters for filtering the left and right sidebands respectively, and one filter out the signal optical local oscillator. and optical carrier
  • the baseband signal at the other filter is the local oscillator of the signal light.
  • optical carrier The baseband signal at the center frequency can be realized by passing the heterodyne beat frequency of the photodetector to two baseband signals.
  • the output optical signal includes two optical local oscillators on the Y polarization state.
  • the baseband signal on the optical fiber is then split into two, each passing through an optical filter, one filtering out the signal optical local oscillator. and optical carrier
  • the baseband signal at the other filter is the local oscillator of the signal light. and optical carrier
  • the receiving link 320 includes a receiving-end IQ modulator 321, a third filter group 322, and a second photodetector group 323;
  • the receiving-end IQ modulator 321 is used to connect to the laser source 10, and is also used to receive a multi-band RF signal received by an antenna, so as to modulate the multi-band RF signal on an optical carrier output by the laser source 10 to obtain a multi-band RF modulated signal; wherein the multi-band optical local oscillator signal provided by the multi-frequency optical local oscillator generating device is used to couple with the multi-band RF modulated signal to obtain a multi-band RF coupled signal; the third filter group 322 is connected to the receiving-end IQ modulator 321, the multi-frequency optical local oscillator The generating device is connected, and the third filter group 322 is used to filter the multi-band RF coupling signal; the second photodetector group 323 is connected to the third filter group 322, and is used to perform heterod
  • the receiving link 320 also includes a second photodetector group 3241 and a fourth polarization beam splitter 3242; the output end of the second photodetector group 3241 is connected to the receiving end IQ modulator 321 and the multi-frequency optical local oscillator generating device 330, and the second photodetector group 3241 is used to control the fourth polarization beam splitter 3242 according to the polarization state angle of the first polarization beam splitter 1141 or the second polarization beam splitter 1242 in the multi-frequency optical local oscillator generating device 330, so that the polarization state angle of the fourth polarization beam splitter 3242 remains the same as that of the first polarization beam splitter 1141 or the second polarization beam splitter 1242; the fourth polarization beam splitter 3242 is connected to the second photodetector group 3241, and the fourth polarization beam splitter 3242 is used to separate the polarization state signal of the multi-band RF
  • the third filter group 322 includes an optical filter 3221, an optical filter 3222, an optical filter 3223, and an optical filter 3224
  • the second photodetector group 323 includes a photodetector 3231, a photodetector 3232, a photodetector 3233, and a photodetector 3234.
  • the optical filter 3221 is connected to the photodetector 3231
  • the optical filter 3221 is used to filter the separated baseband coupling signal according to the first preset frequency
  • the photodetector 3231 is used to convert the filtered baseband coupling signal into an optical signal for output to obtain a radio frequency signal.
  • the optical filter 3222 is connected to the photodetector 3232.
  • the optical filter 3222 is used to filter the separated baseband coupling signal according to the second preset frequency.
  • the photodetector 3232 is used to convert the filtered baseband coupling signal into an optical signal for output to obtain a radio frequency signal.
  • the optical filter 3223 is connected to the photodetector 3233, and the optical filter 3223 is used to filter the separated baseband coupling signal according to the third preset frequency, and the photodetector 3233 is used to convert the filtered baseband coupling signal into an optical signal for output to obtain a radio frequency signal.
  • the optical filter 3224 is connected to the photodetector 3234, and the optical filter 3224 is used to filter the separated baseband coupling signal according to the fourth preset frequency, and the photodetector 3234 is used to convert the filtered baseband coupling signal into an optical signal for output to obtain a radio frequency signal.
  • a receiving-end IQ modulator modulates the multi-band RF signal (center carrier frequencies are ), and the receiving end IQ modulator works in the carrier suppressed double sideband modulation mode, so that there are multi-band RF modulation signals on both sides of the optical carrier.
  • the center carrier frequency of the multi-band RF modulation signal on the left optical carrier can be expressed as:
  • the center carrier frequency of the optical multi-band RF modulated signal on the right can be expressed as:
  • the optical multi-band RF modulated signal is coupled with the optical local oscillator signal generated by the multi-frequency optical local oscillator module, sent to the polarization controller, and separated into two orthogonal polarization states X and Y through the polarization beam splitter.
  • the output optical signal includes the optical local oscillator signals on the two X polarization states ( and ) and a modulated optical carrier
  • the multi-band RF signals on the left and right sides are filtered by two optical filters respectively, and one filter out the signal optical local oscillator
  • the left side of the optical carrier is at the center carrier frequency
  • the right side of the optical carrier is at the center carrier frequency.
  • the two signals are respectively subjected to the heterodyne beat frequency of the photodetector, and the conversion of the two RF signals to baseband signals can be realized; for the reception processing in the Y polarization state, the principle is the same as that in the X polarization state, and will not be repeated here.
  • the output optical local oscillator signal is as follows
  • the proposed transmission link 310, reception link 320 and multi-frequency optical local oscillator signal generating device 330 can be used to simultaneously realize the transmission and reception of four different carrier frequency signals. It can be seen that the communication system proposed in this application has a simple structure, each band frequency can be adjusted independently, has high flexibility and strong feasibility.

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Abstract

The embodiments of the present application belong to the field of microwave photons. Provided are a multi-frequency optical local oscillator generation apparatus and method, and a communication system. The multi-frequency optical local oscillator generation apparatus comprises a carrier modulation module, a photoelectric conversion module and a radio frequency configuration module, wherein the carrier modulation module comprises an in-phase quadrature (IQ) modulator, which is configured to connect to a laser source to perform orthogonal modulation on an optical carrier outputted by means of the laser source, so as to obtain a modulated optical signal; the photoelectric conversion module is connected to the carrier modulation module, and is used for converting the modulated optical signal into an electrical signal; the radio frequency configuration module is connected to the photoelectric conversion module, and is used for configuring the electrical signal to be a plurality of radio frequency signals of preset frequencies; and the IQ modulator is further connected to the radio frequency configuration module, and the IQ modulator is further used for respectively coupling the plurality of radio frequency signals to the optical carrier, so as to obtain a multi-frequency optical local oscillator signal.

Description

多频光本振生成装置、方法及通信***Multi-frequency optical local oscillator generation device, method and communication system
交叉引用cross reference
本申请要求在2022年12月21日提交中国专利局、申请号为202211647184.1、名称为“多频光本振生成装置、方法及通信***”的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。This application claims priority to a Chinese patent application filed with the Chinese Patent Office on December 21, 2022, with application number 202211647184.1 and title “Multi-frequency optical local oscillator generation device, method and communication system”, the entire contents of which are incorporated by reference into this application.
技术领域Technical Field
本申请涉及微波光子的技术领域，尤其涉及一种多频光本振生成装置、方法及通信***。The present application relates to the technical field of microwave photons, and in particular to a multi-frequency optical local oscillator generation device, method and communication system.
背景技术Background technique
随着通信技术的发展，电学器件由于工作带宽的限制，已无法满足高带宽的需求。微波光子技术因其具有超大带宽、低损耗、高并行、低串扰等优势，成为了这一困境的解决方案。光子技术的多波段射频收发通常需要在光域产生一组高度相干的光本振，以实现多频变换。鉴于通讯领域所被分配的有限频谱资源通常是碎片化的，例如对于40GHz的频谱范围，通常只需处理几个窄带频点如2.6GHz、3.5GHz、4.9GHz、28GHz、39GHz等即可。With the development of communication technology, electrical devices can no longer meet the demand for high bandwidth due to the limitation of working bandwidth. Microwave photonic technology has become a solution to this dilemma because of its advantages such as ultra-large bandwidth, low loss, high parallelism and low crosstalk. The multi-band RF transceiver of photonic technology usually needs to generate a set of highly coherent optical local oscillators in the optical domain to achieve multi-frequency conversion. Given that the limited spectrum resources allocated in the communication field are usually fragmented, for example, for a spectrum range of 40GHz, it is usually only necessary to process a few narrowband frequency points such as 2.6GHz, 3.5GHz, 4.9GHz, 28GHz, 39GHz, etc.
目前，光子技术常用的方法是利用一组光频梳作为多频光本振，其对应的多频光本振是一组频率呈等差排列的频谱，因此需要一组梳齿间隔极小(MHz量级)、梳齿数目极多(上百根)的光频梳来覆盖所有的碎片化频谱范围。这对光频梳的产生提出了较为苛刻的要求，不但成本高昂，而且会有大量本振梳齿资源处于闲置状态，因此频谱利用率较低。At present, the commonly used method of photonic technology is to use a set of optical frequency combs as multi-frequency optical local oscillators. The corresponding multi-frequency optical local oscillators are a set of frequencies arranged in an equidistant manner. Therefore, a set of optical frequency combs with extremely small comb tooth spacing (MHz level) and a large number of comb teeth (hundreds) is required to cover all fragmented spectrum ranges. This puts forward relatively stringent requirements on the generation of optical frequency combs. Not only is the cost high, but a large number of local oscillator comb tooth resources are idle, so the spectrum utilization rate is low.
发明内容Summary of the invention
本申请实施例提供一种多频光本振生成装置、方法及通信***，旨在降低生成多频光本振的成本，提高频谱利用率。The embodiments of the present application provide a multi-frequency optical local oscillator generation device, method and communication system, aiming to reduce the cost of generating multi-frequency optical local oscillators and improve spectrum utilization.
第一方面，本申请实施例提供一种多频光本振生成装置，包括：载波调 制模块，包括同相正交IQ调制器，所述IQ调制器用于连接激光源，以对所述激光源输出的光载波进行正交调制，得到调制光信号；光电转换模块，与所述载波调制模块连接，用于将所述调制光信号转换为电信号；射频配置模块，与所述光电转换模块连接，用于将所述电信号配置为多个预设频率的射频信号；其中，所述IQ调制器还连接于所述射频配置模块，所述IQ调制器还用于将多个所述射频信号分别与所述光载波进行耦合，得到多频光本振信号。In a first aspect, an embodiment of the present application provides a multi-frequency optical local oscillator generating device, comprising: a carrier modulation A control module includes an in-phase orthogonal IQ modulator, which is used to connect to a laser source to perform orthogonal modulation on an optical carrier output by the laser source to obtain a modulated optical signal; an optoelectronic conversion module, which is connected to the carrier modulation module and is used to convert the modulated optical signal into an electrical signal; and an RF configuration module, which is connected to the optoelectronic conversion module and is used to configure the electrical signal into a plurality of RF signals of preset frequencies; wherein the IQ modulator is also connected to the RF configuration module, and the IQ modulator is also used to couple the plurality of RF signals with the optical carrier respectively to obtain a multi-frequency optical local oscillator signal.
第二方面，本申请实施例还提供一种多频光本振生成方法，应用于多频光本振生成装置，所述多频光本振生成装置包括载波调制模块、光电转换模块和射频配置模块；其中，所述载波调制模块包括同相正交IQ调制器，所述IQ调制器用于连接激光源；所述光电转换模块与所述载波调制模块连接，所述射频配置模块与所述光电转换模块连接，所述IQ调制器还连接于所述射频配置模块；所述方法包括：通过所述IQ调制器对所述激光源输出的光载波进行正交调制，得到调制光信号；通过所述光电转换模块将所述调制光信号转换为电信号；通过所述射频配置模块将所述电信号配置为多个预设频率的射频信号；通过所述IQ调制器将多个所述射频信号分别与所述光载波进行耦合，得到多频光本振信号。In a second aspect, an embodiment of the present application further provides a multi-frequency optical local oscillator generation method, which is applied to a multi-frequency optical local oscillator generation device, wherein the multi-frequency optical local oscillator generation device includes a carrier modulation module, an optoelectronic conversion module and a radio frequency configuration module; wherein the carrier modulation module includes an in-phase orthogonal IQ modulator, and the IQ modulator is used to connect a laser source; the optoelectronic conversion module is connected to the carrier modulation module, the radio frequency configuration module is connected to the optoelectronic conversion module, and the IQ modulator is also connected to the radio frequency configuration module; the method includes: orthogonally modulating the optical carrier output by the laser source through the IQ modulator to obtain a modulated optical signal; converting the modulated optical signal into an electrical signal through the optoelectronic conversion module; configuring the electrical signal into a plurality of radio frequency signals of preset frequencies through the radio frequency configuration module; and coupling the plurality of radio frequency signals with the optical carrier respectively through the IQ modulator to obtain a multi-frequency optical local oscillator signal.
第三方面，本申请实施例还提供一种通信***，所述通信***包括发射链路和接收链路；以及如本申请实施例提供的任一项多频光本振生成装置，用于为所述发射链路、所述接收链路提供多频光本振信号。In a third aspect, an embodiment of the present application further provides a communication system, which includes a transmitting link and a receiving link; and any multi-frequency optical local oscillator generating device provided in an embodiment of the present application, which is used to provide a multi-frequency optical local oscillator signal for the transmitting link and the receiving link.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1为本申请实施例提供的一种多频光本振生成装置的结构示意框图；FIG1 is a schematic block diagram of the structure of a multi-frequency optical local oscillator generating device provided in an embodiment of the present application;
图2为本申请实施例提供的另一种多频光本振生成装置的结构示意框图；FIG2 is a schematic block diagram of the structure of another multi-frequency optical local oscillator generating device provided in an embodiment of the present application;
图3为本申请实施例提供的另一种多频光本振生成装置的结构示意框图；FIG3 is a schematic block diagram of the structure of another multi-frequency optical local oscillator generating device provided in an embodiment of the present application;
图4为本申请实施例提供的另一种多频光本振生成装置的结构示意框图；FIG4 is a schematic block diagram of the structure of another multi-frequency optical local oscillator generating device provided in an embodiment of the present application;
图5为本申请实施例提供的另一种多频光本振生成装置的结构示意框 图；FIG. 5 is a schematic diagram of the structure of another multi-frequency optical local oscillator generating device provided in an embodiment of the present application. picture;
图6为本申请实施例提供的另一种多频光本振生成装置的结构示意框图；FIG6 is a schematic block diagram of the structure of another multi-frequency optical local oscillator generating device provided in an embodiment of the present application;
图7为本申请实施例提供的另一种多频光本振生成装置的结构示意框图；FIG7 is a schematic block diagram of the structure of another multi-frequency optical local oscillator generating device provided in an embodiment of the present application;
图8为本申请实施例提供的一种多频光本振生成方法的步骤流程示意图；FIG8 is a schematic diagram of a step flow chart of a method for generating a multi-frequency optical local oscillator provided in an embodiment of the present application;
图9为本申请实施例提供的一种通信***的结构示意框图；FIG9 is a schematic block diagram of the structure of a communication system provided in an embodiment of the present application;
图10为本申请实施例提供的另一种通信***的结构示意框图；FIG10 is a schematic block diagram of the structure of another communication system provided in an embodiment of the present application;
图11为本申请实施例提供的另一种通信***的结构示意框图。FIG. 11 is a schematic block diagram of the structure of another communication system provided in an embodiment of the present application.
具体实施方式Detailed ways
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
附图中所示的流程图仅是示例说明，不是必须包括所有的内容和操作/步骤，也不是必须按所描述的顺序执行。例如，有的操作/步骤还可以分解、组合或部分合并，因此实际执行的顺序有可能根据实际情况改变。The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations/steps, nor must they be executed in the order described. For example, some operations/steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.
应当理解，在此本申请说明书中所使用的术语仅仅是出于描述特定实施例的目的而并不意在限制本申请。如在本申请说明书和所附权利要求书中所使用的那样，除非上下文清楚地指明其它情况，否则单数形式的“一”、“一个”及“该”意在包括复数形式。It should be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.
下面结合附图，对本申请的一些实施方式作详细说明。在不冲突的情况下，下述的实施例及实施例中的特征可以相互组合。In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.
请参照图1，图1为本申请实施例提供的一种多频光本振生成装置的示意性框图。Please refer to FIG. 1 , which is a schematic block diagram of a multi-frequency optical local oscillator generating device provided in an embodiment of the present application.
如图1所示，该多频光本振生成装置100包括载波调制模块110、光电转换模块120和射频配置模块130。多频光本振生成装置100与激光源10连接，激光源10用于输出光载波，多频光本振生成装置100能够利用该激光源 10输出的光载波生成多频光本振信号。As shown in FIG1 , the multi-frequency optical local oscillator generating device 100 includes a carrier modulation module 110, an optoelectronic conversion module 120, and a radio frequency configuration module 130. The multi-frequency optical local oscillator generating device 100 is connected to a laser source 10, and the laser source 10 is used to output an optical carrier. The optical carrier output by 10 generates a multi-frequency optical local oscillator signal.
其中，载波调制模块110包括同相正交IQ调制器，IQ调制器用于连接激光源10，以对激光源10输出的光载波进行正交调制，得到调制光信号。光电转换模块120与载波调制模块110连接，用于将调制光信号转换为电信号。射频配置模块130与光电转换模块120连接，用于将电信号配置为多个预设频率的射频信号。IQ调制器还连接于射频配置模块130，IQ调制器还用于将多个射频信号分别与光载波进行耦合，得到多频光本振信号。The carrier modulation module 110 includes an in-phase orthogonal IQ modulator, which is used to connect to the laser source 10 to perform orthogonal modulation on the optical carrier output by the laser source 10 to obtain a modulated optical signal. The photoelectric conversion module 120 is connected to the carrier modulation module 110 and is used to convert the modulated optical signal into an electrical signal. The radio frequency configuration module 130 is connected to the photoelectric conversion module 120 and is used to configure the electrical signal into a plurality of radio frequency signals of preset frequencies. The IQ modulator is also connected to the radio frequency configuration module 130, and the IQ modulator is also used to couple the plurality of radio frequency signals with the optical carrier respectively to obtain a multi-frequency optical local oscillator signal.
需要说明的是，激光源10可以为单波长光源，光载波可以为单波长光信号。IQ调制器可以为马赫曾德尔调制器，光电转换模块120能够将调制光信号进行光电转换得到电信号，之后由射频配置模块130将光电转换得到的电信号配置为多个预设频率的射频信号，多个该射频信号的预设频率可以是相同或者不相同的，射频配置模块130可以将相同或者不相同预设频率的射频信号分别与光载波进行耦合，从而将多个射频信号调制在光载波的左右两侧，得到多频光本振信号。该多频光本振信号可以是两个或两个以上数量的光本振信号，无需使用成本高昂的光频梳或多组光电振荡器，有效降低生成多频光本振的成本，并提高频谱利用率。It should be noted that the laser source 10 can be a single-wavelength light source, and the optical carrier can be a single-wavelength optical signal. The IQ modulator can be a Mach-Zehnder modulator, and the optoelectronic conversion module 120 can perform optoelectronic conversion on the modulated optical signal to obtain an electrical signal, and then the RF configuration module 130 configures the electrical signal obtained by the optoelectronic conversion into a plurality of RF signals of preset frequencies, and the preset frequencies of the plurality of RF signals can be the same or different, and the RF configuration module 130 can couple the RF signals of the same or different preset frequencies with the optical carrier respectively, so as to modulate the plurality of RF signals on the left and right sides of the optical carrier to obtain a multi-frequency optical local oscillator signal. The multi-frequency optical local oscillator signal can be two or more optical local oscillator signals, without the need to use expensive optical frequency combs or multiple groups of optoelectronic oscillators, effectively reducing the cost of generating multi-frequency optical local oscillators and improving spectrum utilization.
示例性的，如图2所示，载波调制模块110包括IQ调制器111，IQ调制器111包括I臂和Q臂两个组成部分，通过IQ调制器111中的I臂和Q臂将光载波分为两路进行载波调制，两路光载波相互正交，即频率相同、相位相差90度的两路光载波分别调制后一起发射，从而实现光载波的本振频率的边带复用，能够提高频谱利用率。Exemplarily, as shown in FIG2 , the carrier modulation module 110 includes an IQ modulator 111, and the IQ modulator 111 includes two components, an I arm and a Q arm. The optical carrier is divided into two paths for carrier modulation through the I arm and the Q arm in the IQ modulator 111. The two optical carriers are orthogonal to each other, that is, two optical carriers with the same frequency and a phase difference of 90 degrees are modulated separately and then transmitted together, thereby realizing sideband multiplexing of the local oscillator frequency of the optical carrier, which can improve spectrum utilization.
示例性的，如图2所示，载波调制模块110还包括单模光纤112；单模光纤112与IQ调制器111连接，用于对IQ调制器111输出的调制光信号进行延时。需要说明的是，通过单模光纤112对调制光信号进行延时，得到延时的调制光信号，该延时的调制光信号用于在输入至光电转换模块120后经过射频配置模块130完成闭环，如此能够提高闭环稳定性。Exemplarily, as shown in Fig. 2, the carrier modulation module 110 further includes a single-mode optical fiber 112; the single-mode optical fiber 112 is connected to the IQ modulator 111, and is used to delay the modulated optical signal output by the IQ modulator 111. It should be noted that the modulated optical signal is delayed by the single-mode optical fiber 112 to obtain a delayed modulated optical signal, and the delayed modulated optical signal is used to complete the closed loop after being input to the optoelectronic conversion module 120 and passing through the RF configuration module 130, so that the closed loop stability can be improved.
需要说明的是，IQ调制器111得到多频光本振信号之后，该多频光本振信号可以经过单模光纤112的延时后输出，也可以不经过单模光纤112的延时而直接输出，本申请实施例对此不做具体限定。It should be noted that after the IQ modulator 111 obtains the multi-frequency optical local oscillator signal, the multi-frequency optical local oscillator signal can be output after being delayed by the single-mode optical fiber 112, or it can be output directly without being delayed by the single-mode optical fiber 112. The embodiment of the present application does not make any specific limitation on this.
在一实施例中，如图2所示，光电转换模块120包括光电探测器121和放大器122；光电探测器121与载波调制模块110连接，用于将调制光信号 转换为电信号；放大器122与光电探测器121连接，用于放大电信号。In one embodiment, as shown in FIG. 2 , the photoelectric conversion module 120 includes a photodetector 121 and an amplifier 122; the photodetector 121 is connected to the carrier modulation module 110 to modulate the optical signal The amplifier 122 is connected to the photodetector 121 to amplify the electrical signal.
需要说明的是，光电转换模块120可以是一路或者多路，多路光电转换模块120可以包括多组光电探测器121和多组放大器122，光电转换模块120的具体路数可以根据实际情况确定。在一些实施例中，光电转换模块120也可以仅包括用于将调制光信号转换为电信号的光电探测器，本实施例对此不做具体限定。It should be noted that the photoelectric conversion module 120 may be one-way or multi-way, and the multi-way photoelectric conversion module 120 may include multiple groups of photodetectors 121 and multiple groups of amplifiers 122. The specific number of paths of the photoelectric conversion module 120 may be determined according to actual conditions. In some embodiments, the photoelectric conversion module 120 may also only include a photodetector for converting a modulated optical signal into an electrical signal, which is not specifically limited in this embodiment.
在一实施例中，如图2所示，射频配置模块130包括功分器131和第一滤波器组132；功分器131与光电转换模块120连接，用于将电信号进行功率分配；第一滤波器组132与功分器131连接，第一滤波器组132用于对电信号进行频率选择，得到多个预设频率的射频信号。其中，预设频率可以是预先设置的多种频率，如F1、F2等，功率分配可以是功率平均分配，从而提高***稳定性。需要说明的是，第一滤波器组132可以包括多个电滤波器，功分器131可以根据多个电滤波器的数量对电信号进行功率均分，各个电滤波器基于各自设置的预设频率对功率分配后的电信号进行频率选择，得到各个电滤波器各自对应的预设频率的射频信号。In one embodiment, as shown in FIG2 , the RF configuration module 130 includes a power divider 131 and a first filter group 132; the power divider 131 is connected to the photoelectric conversion module 120 and is used to distribute power to the electrical signal; the first filter group 132 is connected to the power divider 131, and the first filter group 132 is used to perform frequency selection on the electrical signal to obtain a plurality of RF signals of preset frequencies. Among them, the preset frequency can be a plurality of pre-set frequencies, such as F1, F2, etc., and the power distribution can be an average power distribution, thereby improving the stability of the system. It should be noted that the first filter group 132 may include a plurality of electrical filters, and the power divider 131 can perform power equalization on the electrical signal according to the number of the plurality of electrical filters, and each electrical filter performs frequency selection on the electrical signal after power distribution based on the preset frequency set by each electrical filter, and obtains the RF signal of the preset frequency corresponding to each electrical filter.
在一实施例中，如图2和图3所示，第一滤波器组132包括第一电滤波器1321和第二电滤波器1322，第一电滤波器1321、第二电滤波器1322与功分器连接；第一电滤波器1321用于根据第一预设频率对电信号进行频率选择，得到第一射频信号；第二电滤波器1322用于根据第二预设频率对电信号进行频率选择，得到第二射频信号；第一电滤波器1321、第二电滤波器1322还与IQ调制器111的受控端连接，IQ调制器111还用于将第一射频信号与第二射频信号分别耦合至光载波的边带两侧，得到两频光本振信号。In one embodiment, as shown in Figures 2 and 3, the first filter group 132 includes a first electrical filter 1321 and a second electrical filter 1322, and the first electrical filter 1321 and the second electrical filter 1322 are connected to the power divider; the first electrical filter 1321 is used to perform frequency selection on the electrical signal according to the first preset frequency to obtain a first radio frequency signal; the second electrical filter 1322 is used to perform frequency selection on the electrical signal according to the second preset frequency to obtain a second radio frequency signal; the first electrical filter 1321 and the second electrical filter 1322 are also connected to the controlled end of the IQ modulator 111, and the IQ modulator 111 is also used to couple the first radio frequency signal and the second radio frequency signal to both sides of the sideband of the optical carrier respectively to obtain a two-frequency optical local oscillator signal.
需要说明的是，第一电滤波器1321和第二电滤波器1322可以为可调电滤波器，第一预设频率和第二预设频率可以根据实际情况进行设置，第一电滤波器1321通过频率选择得到的第一射频信号的频率可以为第一预设频率，第二电滤波器1322通过频率选择得到的第二射频信号的频率可以为第二预设频率，IQ调制器111能够将第一射频信号与第二射频信号分别耦合至光载波的边带两侧，从而实现光载波的边路复用，能够提高频谱利用率。It should be noted that the first electrical filter 1321 and the second electrical filter 1322 can be adjustable electrical filters, the first preset frequency and the second preset frequency can be set according to actual conditions, the frequency of the first RF signal obtained by frequency selection by the first electrical filter 1321 can be the first preset frequency, and the frequency of the second RF signal obtained by frequency selection by the second electrical filter 1322 can be the second preset frequency, and the IQ modulator 111 can couple the first RF signal and the second RF signal to both sides of the sideband of the optical carrier respectively, thereby realizing side-channel multiplexing of the optical carrier and improving spectrum utilization.
示例性的，第一电滤波器1321通过频率选择得到的第一射频信号为第二电滤波器1322通过频率选择得到的第二射频信号为利用IQ调制器111的偏置电压，使得IQ调制器111均工作在单边带调制格式下，使得调制 在I臂的第一射频信号将出现在载频的左侧(或右侧)，而调制在Q臂的第二射频信号将出现在载频的右侧(或左侧)。第一电滤波器和第二电滤波器输出的射频信号将分别驱动IQ调制器111的I臂和Q臂进行正交调制，由此，可以获得两个光本振信号 Exemplarily, the first radio frequency signal obtained by the first electrical filter 1321 through frequency selection is The second radio frequency signal obtained by the second electrical filter 1322 through frequency selection is: By using the bias voltage of the IQ modulator 111, the IQ modulator 111 is made to work in the single sideband modulation format, so that the modulation The first RF signal in the I arm Will appear on the carrier frequency The left side (or right side) of the Q arm is modulated by a second RF signal Will appear on the carrier frequency The RF signals output by the first electric filter and the second electric filter will respectively drive the I arm and Q arm of the IQ modulator 111 for orthogonal modulation, thereby obtaining two optical local oscillator signals.
可以理解的是，光电转换模块120为一路时，射频配置模块130也可以为一路。光电转换模块120为多路时，射频配置模块130也可以为多路。射频配置模块130为一路时，第一滤波器组132可以包括第一电滤波器和第二电滤波器之外的其他电滤波器，例如还包括第三电滤波器等。射频配置模块130为多路时，第一滤波器组132可以为多组，每组第一滤波器组132中的多个电滤波器的数量可以相等或者不相等，即多路射频配置模块130可以均包括至少一组第一滤波器组132。It can be understood that when the photoelectric conversion module 120 is one channel, the RF configuration module 130 can also be one channel. When the photoelectric conversion module 120 is multi-channel, the RF configuration module 130 can also be multi-channel. When the RF configuration module 130 is one channel, the first filter group 132 can include other electrical filters besides the first electrical filter and the second electrical filter, for example, also including a third electrical filter. When the RF configuration module 130 is multi-channel, the first filter group 132 can be multiple groups, and the number of multiple electrical filters in each group of the first filter group 132 can be equal or unequal, that is, the multi-channel RF configuration modules 130 can all include at least one group of the first filter group 132.
在一实施例中，IQ调制器可以为多个。载波调制模块110还包括耦合器。耦合器与多个IQ调制器连接，用于将多个IQ调制器输出的调制光信号进行耦合。如图4和图5所示，以两个IQ调制器111为例，载波调制模块110还包括与两个IQ调制器111连接的耦合器113，需要说明的是，通过耦合器113将两个IQ调制器111输出的调制光信号进行耦合，得到耦合的调制光信号，耦合器113还用于输出耦合的调制光信号至光电转换模块120。In one embodiment, there may be multiple IQ modulators. The carrier modulation module 110 further includes a coupler. The coupler is connected to multiple IQ modulators and is used to couple the modulated optical signals output by the multiple IQ modulators. As shown in FIG. 4 and FIG. 5 , taking two IQ modulators 111 as an example, the carrier modulation module 110 further includes a coupler 113 connected to the two IQ modulators 111. It should be noted that the modulated optical signals output by the two IQ modulators 111 are coupled by the coupler 113 to obtain a coupled modulated optical signal. The coupler 113 is also used to output the coupled modulated optical signal to the photoelectric conversion module 120.
示例性的，如图4所示，光电转换模块120包括光电探测器121和放大器122。光电探测器121与耦合器113连接，用于将耦合的调制光信号转换为电信号；放大器122与光电探测器121连接，用于放大电信号。射频配置模块130包括功分器131和两个电滤波器组；功分器131与放大器122连接，用于将放大的电信号进行功率分配；其中一个电滤波器组包括第一电滤波器1321和第二电滤波器1322，另一个电滤波器组包括第三电滤波器1323和第四电滤波器1324，第一电滤波器1321、第二电滤波器1322以及第三电滤波器1323、第四电滤波器1324均与功分器131连接。第一电滤波器1321用于根据第一预设频率对电信号进行频率选择，得到第一射频信号第二电滤波器1322用于根据第二预设频率对电信号进行频率选择，得到第二射频信号第一电滤波器1321、第二电滤波器1322还与一个IQ调制器111的受控端连接，该IQ调制器111还用于将第一射频信号与第二射频信号分别耦合至光载波的边带两侧，得到两频光本振信号第三电滤波器1323用于根据第三预设频率对电信号进行频率选择，得到第三射频信号 第四电滤波器1324用于根据第四预设频率对电信号进行频率选择，得到第四射频信号第三电滤波器1323、第四电滤波器1324还与另一个IQ调制器111的受控端连接，另一个IQ调制器111还用于将第三射频信号与第四射频信号分别耦合至光载波的边带两侧，得到两频光本振信号 Exemplarily, as shown in FIG4 , the photoelectric conversion module 120 includes a photodetector 121 and an amplifier 122. The photodetector 121 is connected to the coupler 113, and is used to convert the coupled modulated optical signal into an electrical signal; the amplifier 122 is connected to the photodetector 121, and is used to amplify the electrical signal. The radio frequency configuration module 130 includes a power divider 131 and two electrical filter groups; the power divider 131 is connected to the amplifier 122, and is used to distribute the power of the amplified electrical signal; one of the electrical filter groups includes a first electrical filter 1321 and a second electrical filter 1322, and the other electrical filter group includes a third electrical filter 1323 and a fourth electrical filter 1324, and the first electrical filter 1321, the second electrical filter 1322, the third electrical filter 1323, and the fourth electrical filter 1324 are all connected to the power divider 131. The first electrical filter 1321 is used to perform frequency selection on the electrical signal according to a first preset frequency to obtain a first radio frequency signal The second electric filter 1322 is used to select the frequency of the electric signal according to the second preset frequency to obtain a second radio frequency signal The first electric filter 1321 and the second electric filter 1322 are also connected to a controlled end of an IQ modulator 111. The IQ modulator 111 is also used to convert the first radio frequency signal With the second RF signal Coupled to the optical carrier On both sides of the sideband, two-frequency optical local oscillator signals are obtained The third electric filter 1323 is used to perform frequency selection on the electric signal according to the third preset frequency to obtain a third radio frequency signal The fourth electric filter 1324 is used to select the frequency of the electric signal according to the fourth preset frequency to obtain a fourth radio frequency signal The third electric filter 1323 and the fourth electric filter 1324 are also connected to the controlled end of another IQ modulator 111, and the other IQ modulator 111 is also used to convert the third RF signal With the fourth radio frequency signal Coupled to the optical carrier On both sides of the sideband, two-frequency optical local oscillator signals are obtained
在一实施例中，如图5所示，光电转换模块120包括分束器123、多个光电探测器121和多个放大器122；分束器123与耦合器113连接，用于将耦合的调制光信号分为多个子调制光信号，并将多个子调制光信号分别输出至多个光电探测器；各光电探测器121与分束器123连接，光电探测器121用于将子调制光信号转换为子电信号；各放大器122与多个光电探测器121一一对应连接，放大器122用于放大子电信号；各放大器122还与多个射频配置模块130一一对应连接，射频配置模块130用于将放大的子电信号配置为预设频率的射频信号。In one embodiment, as shown in Figure 5, the optoelectronic conversion module 120 includes a beam splitter 123, multiple photodetectors 121 and multiple amplifiers 122; the beam splitter 123 is connected to the coupler 113, and is used to divide the coupled modulated optical signal into multiple sub-modulated optical signals, and output the multiple sub-modulated optical signals to multiple photodetectors respectively; each photodetector 121 is connected to the beam splitter 123, and the photodetector 121 is used to convert the sub-modulated optical signal into a sub-electrical signal; each amplifier 122 is connected to the multiple photodetectors 121 in a one-to-one correspondence, and the amplifier 122 is used to amplify the sub-electrical signal; each amplifier 122 is also connected to the multiple RF configuration modules 130 in a one-to-one correspondence, and the RF configuration module 130 is used to configure the amplified sub-electrical signal into a RF signal of a preset frequency.
示例性的，如图5所示，射频配置模块130包括两个功分器131和两个电滤波器组；两个功分器131均与放大器122连接，用于将放大的子电信号进行功率分配；其中一个电滤波器组包括第一电滤波器1321和第二电滤波器1322，另一个电滤波器组包括第三电滤波器1323和第四电滤波器1324，第一电滤波器1321、第二电滤波器1322与其中一个功分器131连接，以及第三电滤波器1323、第四电滤波器1324与另一个功分器131连接。第一电滤波器1321用于根据第一预设频率对子电信号进行频率选择，得到第一射频信号第二电滤波器1322用于根据第二预设频率对子电信号进行频率选择，得到第二射频信号第一电滤波器1321、第二电滤波器1322还与一个IQ调制器111的受控端连接，该IQ调制器111还用于将第一射频信号与第二射频信号分别耦合至光载波的边带两侧，得到两频光本振信号第三电滤波器1323用于根据第三预设频率对子电信号进行频率选择，得到第三射频信号第四电滤波器1324用于根据第四预设频率对子电信号进行频率选择，得到第四射频信号第三电滤波器1323、第四电滤波器1324还与另一个IQ调制器111的受控端连接，另一个IQ调制器111还用于将第三射频信号与第四射频信号分别耦合至光载波的边带两侧，得到两频光本振信号 Exemplarily, as shown in FIG5 , the RF configuration module 130 includes two power dividers 131 and two electric filter groups; both power dividers 131 are connected to the amplifier 122 to distribute the power of the amplified sub-electrical signals; one of the electric filter groups includes a first electric filter 1321 and a second electric filter 1322, and the other electric filter group includes a third electric filter 1323 and a fourth electric filter 1324, the first electric filter 1321 and the second electric filter 1322 are connected to one of the power dividers 131, and the third electric filter 1323 and the fourth electric filter 1324 are connected to the other power divider 131. The first electric filter 1321 is used to perform frequency selection on the sub-electrical signal according to the first preset frequency to obtain a first RF signal The second electric filter 1322 is used to select the frequency of the sub-electrical signal according to the second preset frequency to obtain a second radio frequency signal The first electric filter 1321 and the second electric filter 1322 are also connected to a controlled end of an IQ modulator 111. The IQ modulator 111 is also used to convert the first radio frequency signal With the second RF signal Coupled to the optical carrier On both sides of the sideband, two-frequency optical local oscillator signals are obtained The third electrical filter 1323 is used to select the frequency of the sub-electrical signal according to the third preset frequency to obtain a third radio frequency signal The fourth electrical filter 1324 is used to perform frequency selection on the sub-electrical signal according to the fourth preset frequency to obtain a fourth radio frequency signal The third electric filter 1323 and the fourth electric filter 1324 are also connected to the controlled end of another IQ modulator 111, and the other IQ modulator 111 is also used to convert the third RF signal With the fourth radio frequency signal Coupled to the optical carrier On both sides of the sideband, two-frequency optical local oscillator signals are obtained
在一实施例中，如图6所示，IQ调制器111包括第一IQ调制器1111和第二IQ调制器1112，载波调制模块110还包括第一偏振分束器1141和第一 偏振合束器1142；第一偏振分束器1141与激光源10连接，用于将光载波分为第一偏振态信号和第二偏振态信号；第一IQ调制器1111与第一偏振分束器1141连接，用于将第一偏振态信号进行正交调制，得到第一调制光信号；第二IQ调制器1112与第一偏振分束器1141连接，用于将第二偏振态信号进行正交调制，得到第二调制光信号；偏振合束器1142与第一IQ调制器1111、第二IQ调制器1112连接，用于合束第一调制光信号和第二调制光信号，得到调制光信号，该调制光信号为偏振复用的光信号。In one embodiment, as shown in FIG. 6 , the IQ modulator 111 includes a first IQ modulator 1111 and a second IQ modulator 1112, and the carrier modulation module 110 also includes a first polarization beam splitter 1141 and a first Polarization beam combiner 1142; the first polarization beam splitter 1141 is connected to the laser source 10, and is used to split the optical carrier into a first polarization state signal and a second polarization state signal; the first IQ modulator 1111 is connected to the first polarization beam splitter 1141, and is used to orthogonally modulate the first polarization state signal to obtain a first modulated optical signal; the second IQ modulator 1112 is connected to the first polarization beam splitter 1141, and is used to orthogonally modulate the second polarization state signal to obtain a second modulated optical signal; the polarization beam combiner 1142 is connected to the first IQ modulator 1111 and the second IQ modulator 1112, and is used to combine the first modulated optical signal and the second modulated optical signal to obtain a modulated optical signal, which is a polarization multiplexed optical signal.
在一实施例中，如图6所示，光电转换模块120包括第一偏振控制器1241、第二偏振分束器1242、第一光电转换单元1201和第二光电转换单元1202；第一偏振控制器1241与第一偏振合束器1142连接，第一偏振控制器1241用于根据第一偏振分束器1141的偏振态角度对第二偏振分束器1242进行控制，以使第二偏振分束器1242与第一偏振分束器1141的偏振态角度保持相同；第二偏振分束器1242与第一偏振控制器1241连接，第二偏振分束器1242用于将调制光信号分为第三偏振态信号和第四偏振态信号；第一光电转换单元1201、第二光电转换单元1202与第二偏振分束器1242连接，第一光电转换单元1201用于将第三偏振态信号转换为第一电信号，第二光电转换单元1202用于将第四偏振态信号转换为第二电信号；第一光电转换单元1201、第二光电转换单元1202还与射频配置模块130连接，射频配置模块130用于将第一电信号、第二电信号分别配置为两个预设频率的射频信号。In one embodiment, as shown in FIG6 , the photoelectric conversion module 120 includes a first polarization controller 1241, a second polarization beam splitter 1242, a first photoelectric conversion unit 1201, and a second photoelectric conversion unit 1202; the first polarization controller 1241 is connected to the first polarization beam combiner 1142, and the first polarization controller 1241 is used to control the second polarization beam splitter 1242 according to the polarization state angle of the first polarization beam splitter 1141, so that the polarization state angle of the second polarization beam splitter 1242 and the first polarization beam splitter 1141 remain the same; the second polarization beam splitter 1242 is connected to the first polarization controller 1241, and the second polarization beam splitter 1242 is connected to the first polarization controller 1241. The polarization beam splitter 1242 is used to split the modulated optical signal into a third polarization state signal and a fourth polarization state signal; the first photoelectric conversion unit 1201 and the second photoelectric conversion unit 1202 are connected to the second polarization beam splitter 1242, the first photoelectric conversion unit 1201 is used to convert the third polarization state signal into a first electrical signal, and the second photoelectric conversion unit 1202 is used to convert the fourth polarization state signal into a second electrical signal; the first photoelectric conversion unit 1201 and the second photoelectric conversion unit 1202 are also connected to the radio frequency configuration module 130, and the radio frequency configuration module 130 is used to configure the first electrical signal and the second electrical signal into two radio frequency signals of preset frequencies, respectively.
示例性的，如图6和图7所示，第一光电转换单元1201和第二光电转换单元1202分别包括一路光电探测器121和放大器122。光电探测器121与第二偏振分束器1242连接，用于将第三偏振态信号或第四偏振态信号转换为电信号；放大器122与光电探测器121连接，用于放大电信号。射频配置模块130包括功分器131和两个电滤波器组132；功分器131与放大器122连接，用于将放大的电信号进行功率分配；其中一个电滤波器组132包括第一电滤波器1321和第二电滤波器1322，另一个电滤波器组132包括第三电滤波器1323和第四电滤波器1324，第一电滤波器1321、第二电滤波器1322以及第三电滤波器1323、第四电滤波器1324均与功分器131连接。第一电滤波器1321用于根据第一预设频率对电信号进行频率选择，得到第一射频信号第二电滤波器1322用于根据第二预设频率对电信号进行频率选择，得到第二射频信号第一电滤波器1321、第二电滤波器1322还与一个IQ调制器111 的受控端连接，该IQ调制器111还用于将第一射频信号与第二射频信号分别耦合至光载波的X偏振态上的边带两侧，得到X偏振态上的两频光本振信号第三电滤波器1323用于根据第三预设频率对电信号进行频率选择，得到第三射频信号第四电滤波器1324用于根据第四预设频率对电信号进行频率选择，得到第四射频信号第三电滤波器1323、第四电滤波器1324还与另一个IQ调制器111的受控端连接，另一个IQ调制器111还用于将第三射频信号与第四射频信号分别耦合至光载波的Y偏振态上的边带两侧，得到Y偏振态上的两频光本振信号 Exemplarily, as shown in FIG6 and FIG7, the first photoelectric conversion unit 1201 and the second photoelectric conversion unit 1202 respectively include a photodetector 121 and an amplifier 122. The photodetector 121 is connected to the second polarization beam splitter 1242, and is used to convert the third polarization state signal or the fourth polarization state signal into an electrical signal; the amplifier 122 is connected to the photodetector 121, and is used to amplify the electrical signal. The radio frequency configuration module 130 includes a power divider 131 and two electrical filter groups 132; the power divider 131 is connected to the amplifier 122, and is used to distribute the power of the amplified electrical signal; one of the electrical filter groups 132 includes a first electrical filter 1321 and a second electrical filter 1322, and the other electrical filter group 132 includes a third electrical filter 1323 and a fourth electrical filter 1324, and the first electrical filter 1321, the second electrical filter 1322, the third electrical filter 1323, and the fourth electrical filter 1324 are all connected to the power divider 131. The first electric filter 1321 is used to select the frequency of the electric signal according to the first preset frequency to obtain a first radio frequency signal The second electric filter 1322 is used to select the frequency of the electric signal according to the second preset frequency to obtain a second radio frequency signal The first electric filter 1321 and the second electric filter 1322 are also connected to an IQ modulator 111 The IQ modulator 111 is also used to convert the first radio frequency signal With the second RF signal Coupled to the optical carrier On both sides of the sideband in the X polarization state, the two-frequency optical local oscillator signal in the X polarization state is obtained. The third electric filter 1323 is used to select the frequency of the electric signal according to the third preset frequency to obtain a third radio frequency signal The fourth electric filter 1324 is used to select the frequency of the electric signal according to the fourth preset frequency to obtain a fourth radio frequency signal The third electric filter 1323 and the fourth electric filter 1324 are also connected to the controlled end of another IQ modulator 111, and the other IQ modulator 111 is also used to convert the third RF signal With the fourth radio frequency signal Coupled to the optical carrier On both sides of the sideband on the Y polarization state, the two-frequency optical local oscillator signal on the Y polarization state is obtained.
需要说明的是，如图6和图7所示，输入的光载波在两个正交偏振态上形成各自独立的振荡环路，再利用每个偏振态上的IQ调制器的边带复用，在上下两个光边带上又形成两个独立的振荡环路，由此可以利用一个IQ调制器产生四个独立的光电振荡器环路，获得四个独立的光本振信号 且每个光本振信号可以依靠各自环路中的电滤波器实现频率独立调谐。通过边带复用和偏振复用的原理，有效提高了频谱利用率，并且结构紧凑、性价比高。It should be noted that, as shown in Figures 6 and 7, the input optical carrier forms independent oscillation loops in two orthogonal polarization states, and then uses the sideband multiplexing of the IQ modulator in each polarization state to form two independent oscillation loops in the upper and lower optical sidebands. Thus, one IQ modulator can be used to generate four independent optoelectronic oscillator loops to obtain four independent optical local oscillator signals. Each optical local oscillator signal can achieve independent frequency tuning by relying on the electrical filter in its own loop. Through the principle of sideband multiplexing and polarization multiplexing, the spectrum utilization is effectively improved, and the structure is compact and cost-effective.
需要说明的是，本申请实施例旨在克服现有多频光本振实现方式成本高昂且光谱资源大量浪费的缺点，提供一种基于边带复用和偏振复用的多频光本振产生方案，通过多重复用方式实现单路上四个频率可调的独立相干光本振信号的同时产生，不仅可以在宽谱范围内实现光本振信号的灵活可重构，还以高性价比的方式提高了频谱利用率，相较于传统光电振荡器通常一路只能产生一个振荡频率，具有明显优势。It should be noted that the embodiments of the present application aim to overcome the shortcomings of the existing multi-frequency optical local oscillator implementation methods, such as high cost and large waste of spectral resources, and provide a multi-frequency optical local oscillator generation solution based on sideband multiplexing and polarization multiplexing. The solution can realize the simultaneous generation of four independent coherent optical local oscillator signals with adjustable frequencies on a single path through multiplexing. This not only realizes the flexible reconfiguration of optical local oscillator signals within a wide spectrum range, but also improves the spectrum utilization in a cost-effective manner. This solution has obvious advantages over traditional optoelectronic oscillators that can usually only generate one oscillation frequency on one path.
上述实施例提供的多频光本振生成装置100，包括载波调制模块110、光电转换模块120和射频配置模块130；其中，载波调制模块110包括同相正交IQ调制器111，IQ调制器111用于连接激光源10，以对激光源10输出的光载波进行正交调制，得到调制光信号；光电转换模块120与载波调制模块110连接，用于将调制光信号转换为电信号；射频配置模块130与光电转换模块120连接，用于将电信号配置为多个预设频率的射频信号；IQ调制器111还连接于射频配置模块130，IQ调制器111还用于将多个射频信号分别与光载波进行耦合，得到多频光本振信号。本申请实施例通过IQ调制器111将多个预设频率的射频信号分别与光载波进行耦合，从而实现本振频率的边带复用，能够以高性价比的方式得到多频段的光本振信号，有效降低生成多频光 本振的成本，并提高频谱利用率。The multi-frequency optical local oscillator generating device 100 provided in the above embodiment includes a carrier modulation module 110, an optoelectronic conversion module 120 and a radio frequency configuration module 130; wherein the carrier modulation module 110 includes an in-phase orthogonal IQ modulator 111, and the IQ modulator 111 is used to connect to the laser source 10 to perform orthogonal modulation on the optical carrier output by the laser source 10 to obtain a modulated optical signal; the optoelectronic conversion module 120 is connected to the carrier modulation module 110, and is used to convert the modulated optical signal into an electrical signal; the radio frequency configuration module 130 is connected to the optoelectronic conversion module 120, and is used to configure the electrical signal into a plurality of radio frequency signals of preset frequencies; the IQ modulator 111 is also connected to the radio frequency configuration module 130, and the IQ modulator 111 is also used to couple the plurality of radio frequency signals with the optical carrier respectively to obtain a multi-frequency optical local oscillator signal. The embodiment of the present application couples the plurality of radio frequency signals of preset frequencies with the optical carrier respectively through the IQ modulator 111, thereby realizing the sideband multiplexing of the local oscillator frequency, and can obtain optical local oscillator signals of multiple frequency bands in a cost-effective manner, effectively reducing the generation of multi-frequency optical local oscillator signals. The cost of the local oscillator can be reduced and the spectrum utilization can be improved.
请参照图8，图8为本申请实施例提供的一种多频光本振生成方法的步骤流程示意图。Please refer to FIG. 8 , which is a schematic flow chart of the steps of a method for generating a multi-frequency optical local oscillator provided in an embodiment of the present application.
其中，该多频光本振生成方法可应用于多频光本振生成装置，多频光本振生成装置包括载波调制模块、光电转换模块和射频配置模块；其中，载波调制模块包括同相正交IQ调制器，IQ调制器用于连接激光源；光电转换模块与载波调制模块连接，射频配置模块与光电转换模块连接，IQ调制器还连接于射频配置模块。需要说明的是，该多频光本振生成装置可以参考前述图1至图7中的多频光本振生成装置。The multi-frequency optical local oscillator generation method can be applied to a multi-frequency optical local oscillator generation device, which includes a carrier modulation module, an optoelectronic conversion module, and a radio frequency configuration module; wherein the carrier modulation module includes an in-phase orthogonal IQ modulator, and the IQ modulator is used to connect to a laser source; the optoelectronic conversion module is connected to the carrier modulation module, the radio frequency configuration module is connected to the optoelectronic conversion module, and the IQ modulator is also connected to the radio frequency configuration module. It should be noted that the multi-frequency optical local oscillator generation device can refer to the multi-frequency optical local oscillator generation device in Figures 1 to 7 above.
如图8所示，该多频光本振生成方法包括步骤S201至步骤S204。以下进行具体说明：As shown in FIG8 , the multi-frequency optical local oscillator generation method includes steps S201 to S204. The following is a detailed description:
步骤S201、通过IQ调制器对激光源输出的光载波进行正交调制，得到调制光信号。Step S201: quadrature modulate the optical carrier output by the laser source through an IQ modulator to obtain a modulated optical signal.
需要说明的是，激光源可以为单波长光源，光载波可以为单波长光信号。IQ调制器可以为马赫曾德尔调制器。例如，IQ调制器111包括I臂和Q臂两个组成部分，通过IQ调制器111中的I臂和Q臂将光载波分为两路进行载波调制，两路光载波相互正交，即频率相同、相位相差90度的两路光载波分别调制后一起发射，得到调制光信号。It should be noted that the laser source may be a single-wavelength light source, and the optical carrier may be a single-wavelength optical signal. The IQ modulator may be a Mach-Zehnder modulator. For example, the IQ modulator 111 includes two components, an I arm and a Q arm. The optical carrier is divided into two paths for carrier modulation through the I arm and the Q arm in the IQ modulator 111. The two paths of optical carriers are orthogonal to each other, that is, the two paths of optical carriers with the same frequency and a phase difference of 90 degrees are modulated separately and then transmitted together to obtain a modulated optical signal.
在一实施例中，载波调制模块还包括单模光纤；单模光纤与IQ调制器连接，用于对IQ调制器输出的调制光信号进行延时。需要说明的是，通过单模光纤对调制光信号进行延时，得到延时的调制光信号，该延时的调制光信号用于在输入至光电转换模块后经过射频配置模块完成闭环，如此能够提高闭环稳定性。In one embodiment, the carrier modulation module further includes a single-mode optical fiber; the single-mode optical fiber is connected to the IQ modulator and is used to delay the modulated optical signal output by the IQ modulator. It should be noted that the modulated optical signal is delayed by the single-mode optical fiber to obtain a delayed modulated optical signal, and the delayed modulated optical signal is used to complete the closed loop after being input into the optoelectronic conversion module and then passed through the RF configuration module, so that the closed loop stability can be improved.
在一实施例中，IQ调制器可以为多个。载波调制模块还包括耦合器。耦合器与多个IQ调制器连接，用于将多个IQ调制器输出的调制光信号进行耦合。In one embodiment, there may be multiple IQ modulators. The carrier modulation module further includes a coupler. The coupler is connected to the multiple IQ modulators and is used to couple the modulated optical signals output by the multiple IQ modulators.
在一实施例中，IQ调制器包括第一IQ调制器和第二IQ调制器，载波调制模块还包括第一偏振分束器和第一偏振合束器；第一偏振分束器与激光源连接，用于将光载波分为第一偏振态信号和第二偏振态信号；第一IQ调制器与第一偏振分束器连接，用于将第一偏振态信号进行正交调制，得到第一调制光信号；第二IQ调制器与第一偏振分束器连接，用于将第二偏振态信号进 行正交调制，得到第二调制光信号；偏振合束器与第一IQ调制器、第二IQ调制器连接，用于合束第一调制光信号和第二调制光信号，得到调制光信号，该调制光信号为偏振复用的光信号。In one embodiment, the IQ modulator includes a first IQ modulator and a second IQ modulator, and the carrier modulation module also includes a first polarization beam splitter and a first polarization beam combiner; the first polarization beam splitter is connected to the laser source and is used to split the optical carrier into a first polarization state signal and a second polarization state signal; the first IQ modulator is connected to the first polarization beam splitter and is used to orthogonally modulate the first polarization state signal to obtain a first modulated optical signal; the second IQ modulator is connected to the first polarization beam splitter and is used to orthogonally modulate the second polarization state signal to obtain a first modulated optical signal. The first IQ modulator and the second IQ modulator are connected to the polarization combiner for combining the first modulated optical signal and the second modulated optical signal to obtain a modulated optical signal, which is a polarization multiplexed optical signal.
步骤S202、通过光电转换模块将调制光信号转换为电信号。Step S202: convert the modulated optical signal into an electrical signal through a photoelectric conversion module.
在一实施例中，光电转换模块包括光电探测器和放大器；光电探测器与载波调制模块连接，用于将调制光信号转换为电信号；放大器与光电探测器连接，用于放大电信号。需要说明的是，光电转换模块可以是一路或者多路，多路光电转换模块可以包括多组光电探测器和多组放大器，光电转换模块的具体路数可以根据实际情况确定。在一些实施例中，光电转换模块也可以仅包括用于将调制光信号转换为电信号的光电探测器，本实施例对此不做具体限定。In one embodiment, the photoelectric conversion module includes a photodetector and an amplifier; the photodetector is connected to the carrier modulation module to convert the modulated optical signal into an electrical signal; the amplifier is connected to the photodetector to amplify the electrical signal. It should be noted that the photoelectric conversion module can be one-way or multi-way, and the multi-way photoelectric conversion module can include multiple groups of photodetectors and multiple groups of amplifiers. The specific number of channels of the photoelectric conversion module can be determined according to actual conditions. In some embodiments, the photoelectric conversion module may also only include a photodetector for converting the modulated optical signal into an electrical signal, and this embodiment does not specifically limit this.
在一实施例中，IQ调制器为多个，且载波调制模块还包括耦合器的情形下，光电转换模块中的光电探测器与耦合器连接，用于将耦合的调制光信号转换为电信号；放大器与光电探测器连接，用于放大电信号。In one embodiment, when there are multiple IQ modulators and the carrier modulation module also includes a coupler, the photodetector in the photoelectric conversion module is connected to the coupler to convert the coupled modulated optical signal into an electrical signal; and the amplifier is connected to the photodetector to amplify the electrical signal.
在一实施例中，IQ调制器为多个，且载波调制模块还包括耦合器的情形下，光电转换模块包括分束器、多个光电探测器和多个放大器；分束器与耦合器连接，用于将耦合的调制光信号分为多个子调制光信号，并将多个子调制光信号分别输出至多个光电探测器；各光电探测器与分束器连接，光电探测器用于将子调制光信号转换为子电信号；各放大器与多个光电探测器一一对应连接，放大器用于放大子电信号；各放大器还与多个射频配置模块一一对应连接，射频配置模块用于将放大的子电信号配置为预设频率的射频信号。In one embodiment, when there are multiple IQ modulators and the carrier modulation module also includes a coupler, the optoelectronic conversion module includes a beam splitter, multiple photodetectors and multiple amplifiers; the beam splitter is connected to the coupler, and is used to divide the coupled modulated optical signal into multiple sub-modulated optical signals, and output the multiple sub-modulated optical signals to multiple photodetectors respectively; each photodetector is connected to the beam splitter, and the photodetector is used to convert the sub-modulated optical signal into a sub-electrical signal; each amplifier is connected to the multiple photodetectors in a one-to-one correspondence, and the amplifier is used to amplify the sub-electrical signal; each amplifier is also connected to multiple RF configuration modules in a one-to-one correspondence, and the RF configuration module is used to configure the amplified sub-electrical signal into an RF signal of a preset frequency.
在一实施例中，IQ调制器包括第一IQ调制器和第二IQ调制器的情形下，光电转换模块可以包括第一偏振控制器、第二偏振分束器、第一光电转换单元和第二光电转换单元；第一偏振控制器与第一偏振合束器连接，第一偏振控制器用于根据第一偏振分束器的偏振态角度对第二偏振分束器进行控制，以使第二偏振分束器与第一偏振分束器的偏振态角度保持相同；第二偏振分束器与第一偏振控制器连接，第二偏振分束器用于将调制光信号分为第三偏振态信号和第四偏振态信号；第一光电转换单元、第二光电转换单元与第二偏振分束器连接，第一光电转换单元用于将第三偏振态信号转换为第一电信号，第二光电转换单元用于将第四偏振态信号转换为第二电信号；第一光电转换单元、第二光电转换单元还与射频配置模块连接，射频配置模块用于将 第一电信号、第二电信号分别配置为两个预设频率的射频信号。In one embodiment, when the IQ modulator includes a first IQ modulator and a second IQ modulator, the photoelectric conversion module may include a first polarization controller, a second polarization beam splitter, a first photoelectric conversion unit and a second photoelectric conversion unit; the first polarization controller is connected to the first polarization beam combiner, and the first polarization controller is used to control the second polarization beam splitter according to the polarization state angle of the first polarization beam splitter, so that the polarization state angle of the second polarization beam splitter and the first polarization beam splitter remain the same; the second polarization beam splitter is connected to the first polarization controller, and the second polarization beam splitter is used to divide the modulated optical signal into a third polarization state signal and a fourth polarization state signal; the first photoelectric conversion unit and the second photoelectric conversion unit are connected to the second polarization beam splitter, the first photoelectric conversion unit is used to convert the third polarization state signal into a first electrical signal, and the second photoelectric conversion unit is used to convert the fourth polarization state signal into a second electrical signal; the first photoelectric conversion unit and the second photoelectric conversion unit are also connected to the RF configuration module, and the RF configuration module is used to convert The first electrical signal and the second electrical signal are respectively configured as radio frequency signals of two preset frequencies.
步骤S203、通过射频配置模块将电信号配置为多个预设频率的射频信号。Step S203: configuring the electrical signal into radio frequency signals of multiple preset frequencies through a radio frequency configuration module.
需要说明的是，射频配置模块将光电转换得到的电信号配置为多个预设频率的射频信号，多个该射频信号的预设频率可以是相同或者不相同的，射频配置模块还可以将相同或者不相同预设频率的射频信号输出至IQ调制器。It should be noted that the RF configuration module configures the electrical signal obtained by photoelectric conversion into a plurality of RF signals of preset frequencies, and the preset frequencies of the plurality of RF signals may be the same or different. The RF configuration module may also output RF signals of the same or different preset frequencies to the IQ modulator.
在一实施例中，射频配置模块包括功分器和第一滤波器组；功分器与光电转换模块连接，用于将电信号进行功率分配；第一滤波器组与功分器连接，第一滤波器组用于对电信号进行频率选择，得到多个预设频率的射频信号。In one embodiment, the RF configuration module includes a power divider and a first filter group; the power divider is connected to the photoelectric conversion module and is used to distribute the power of the electrical signal; the first filter group is connected to the power divider, and the first filter group is used to select the frequency of the electrical signal to obtain RF signals of multiple preset frequencies.
其中，预设频率可以是预先设置的多种频率，如F1、F2等，功率分配可以是功率平均分配，从而提高***稳定性。需要说明的是，第一滤波器组可以包括多个电滤波器，功分器可以根据多个电滤波器的数量对电信号进行功率均分，各个电滤波器基于各自设置的预设频率对功率分配后的电信号进行频率选择，得到各个电滤波器各自对应的预设频率的射频信号。The preset frequency may be a plurality of pre-set frequencies, such as F1, F2, etc., and the power distribution may be an average power distribution, thereby improving the stability of the system. It should be noted that the first filter group may include a plurality of electrical filters, the power divider may perform power equalization on the electrical signal according to the number of the plurality of electrical filters, and each electrical filter performs frequency selection on the electrical signal after power distribution based on the preset frequency set by each electrical filter, thereby obtaining a radio frequency signal of the preset frequency corresponding to each electrical filter.
示例性的，第一滤波器组包括第一电滤波器和第二电滤波器，第一电滤波器、第二电滤波器与功分器连接；第一电滤波器用于根据第一预设频率对电信号进行频率选择，得到第一射频信号；第二电滤波器用于根据第二预设频率对电信号进行频率选择，得到第二射频信号；第一电滤波器、第二电滤波器还与IQ调制器的受控端连接，IQ调制器还用于将第一射频信号与第二射频信号分别耦合至光载波的边带两侧，得到两频光本振信号。Exemplarily, the first filter group includes a first electrical filter and a second electrical filter, and the first electrical filter and the second electrical filter are connected to a power divider; the first electrical filter is used to perform frequency selection on the electrical signal according to a first preset frequency to obtain a first radio frequency signal; the second electrical filter is used to perform frequency selection on the electrical signal according to a second preset frequency to obtain a second radio frequency signal; the first electrical filter and the second electrical filter are also connected to a controlled end of an IQ modulator, and the IQ modulator is also used to couple the first radio frequency signal and the second radio frequency signal to both sides of the sideband of the optical carrier, respectively, to obtain a two-frequency optical local oscillator signal.
需要说明的是，第一电滤波器和第二电滤波器可以为可调电滤波器，第一预设频率和第二预设频率可以根据实际情况进行设置，第一电滤波器通过频率选择得到的第一射频信号的频率可以为第一预设频率，第二电滤波器通过频率选择得到的第二射频信号的频率可以为第二预设频率，IQ调制器能够将第一射频信号与第二射频信号分别耦合至光载波的边带两侧，从而实现光载波的边路复用，能够提高频谱利用率。It should be noted that the first electrical filter and the second electrical filter can be adjustable electrical filters, the first preset frequency and the second preset frequency can be set according to actual conditions, the frequency of the first RF signal obtained by frequency selection by the first electrical filter can be the first preset frequency, and the frequency of the second RF signal obtained by frequency selection by the second electrical filter can be the second preset frequency. The IQ modulator can couple the first RF signal and the second RF signal to both sides of the sideband of the optical carrier respectively, thereby realizing side-channel multiplexing of the optical carrier and improving spectrum utilization.
在一实施例中，IQ调制器包括第一IQ调制器和第二IQ调制器的情形下，射频配置模块包括功分器和两个电滤波器组；功分器与放大器连接，用于将放大的电信号进行功率分配；其中一个电滤波器组包括第一电滤波器和第二电滤波器，另一个电滤波器组包括第三电滤波器和第四电滤波器，第一电滤波器、第二电滤波器以及第三电滤波器、第四电滤波器均与功分器连接。第 一电滤波器用于根据第一预设频率对电信号进行频率选择，得到第一射频信号第二电滤波器用于根据第二预设频率对电信号进行频率选择，得到第二射频信号第三电滤波器用于根据第三预设频率对电信号进行频率选择，得到第三射频信号第四电滤波器用于根据第四预设频率对电信号进行频率选择，得到第四射频信号 In one embodiment, when the IQ modulator includes a first IQ modulator and a second IQ modulator, the RF configuration module includes a power divider and two electric filter groups; the power divider is connected to the amplifier and is used to distribute the power of the amplified electric signal; one of the electric filter groups includes a first electric filter and a second electric filter, and the other electric filter group includes a third electric filter and a fourth electric filter, and the first electric filter, the second electric filter, the third electric filter, and the fourth electric filter are all connected to the power divider. An electric filter is used to select the frequency of the electric signal according to the first preset frequency to obtain a first radio frequency signal The second electric filter is used to select the frequency of the electric signal according to the second preset frequency to obtain a second radio frequency signal The third electric filter is used to perform frequency selection on the electric signal according to the third preset frequency to obtain a third radio frequency signal The fourth electric filter is used to select the frequency of the electric signal according to the fourth preset frequency to obtain a fourth radio frequency signal
步骤S204、通过IQ调制器将多个射频信号分别与光载波进行耦合，得到多频光本振信号。Step S204: multiple radio frequency signals are coupled to the optical carrier through an IQ modulator to obtain multi-frequency optical local oscillator signals.
需要说明的是，通过IQ调制器可以将相同或者不相同预设频率的射频信号分别与光载波进行耦合，从而将多个射频信号调制在光载波的左右两侧，得到多频光本振信号。该多频光本振信号可以是两个或两个以上数量的光本振信号，无需使用成本高昂的光频梳或多组光电振荡器，有效降低生成多频光本振的成本，并提高频谱利用率。It should be noted that, through the IQ modulator, RF signals of the same or different preset frequencies can be coupled to the optical carrier respectively, so that multiple RF signals are modulated on the left and right sides of the optical carrier to obtain a multi-frequency optical local oscillator signal. The multi-frequency optical local oscillator signal can be two or more optical local oscillator signals, without the need to use expensive optical frequency combs or multiple groups of optoelectronic oscillators, effectively reducing the cost of generating multi-frequency optical local oscillators and improving spectrum utilization.
在一实施例中，IQ调制器为一个的情形下，第一电滤波器通过频率选择得到的第一射频信号为第二电滤波器通过频率选择得到的第二射频信号为利用IQ调制器的偏置电压，使得IQ调制器均工作在单边带调制格式下，使得调制在I臂的第一射频信号将出现在载频的左侧(或右侧)，而调制在Q臂的第二射频信号将出现在载频的右侧(或左侧)。第一电滤波器和第二电滤波器输出的射频信号将分别驱动IQ调制器的I臂和Q臂进行正交调制，由此，可以获得两个光本振信号 In one embodiment, when there is only one IQ modulator, the first radio frequency signal obtained by the first electrical filter through frequency selection is: The second radio frequency signal obtained by the second electric filter through frequency selection is: By using the bias voltage of the IQ modulator, the IQ modulator is made to work in the single sideband modulation format, so that the first RF signal modulated in the I arm Will appear on the carrier frequency The left side (or right side) of the Q arm is modulated by a second RF signal Will appear on the carrier frequency The RF signals output by the first and second electrical filters will drive the I arm and Q arm of the IQ modulator to perform orthogonal modulation, thereby obtaining two optical local oscillator signals.
在一实施例中，IQ调制器为多个，且载波调制模块还包括耦合器的情形下，射频配置模块例如包括两个电滤波器组，其中一个电滤波器组包括第一电滤波器和第二电滤波器，另一个电滤波器组包括第三电滤波器和第四电滤波器。第一电滤波器用于根据第一预设频率对子电信号进行频率选择，得到第一射频信号第二电滤波器用于根据第二预设频率对子电信号进行频率选择，得到第二射频信号第一电滤波器、第二电滤波器还与一个IQ调制器的受控端连接，该IQ调制还用于将第一射频信号与第二射频信号分别耦合至光载波的边带两侧，得到两频光本振信号第三电滤波器用于根据第三预设频率对子电信号进行频率选择，得到第三射频信号第四电滤波器用于根据第四预设频率对子电信号进行频率选择，得到第四射频信号第三电滤波器、第四电滤波器还与另一个IQ调制器的受控端连接，另一个IQ调制器还用于将第三射频信号与第四射频信号分别耦合至光载 波的边带两侧，得到两频光本振信号 In one embodiment, when there are multiple IQ modulators and the carrier modulation module further includes a coupler, the RF configuration module includes, for example, two electric filter groups, one of which includes a first electric filter and a second electric filter, and the other electric filter group includes a third electric filter and a fourth electric filter. The first electric filter is used to perform frequency selection on the sub-electrical signal according to the first preset frequency to obtain the first RF signal The second electric filter is used to select the frequency of the sub-electrical signal according to the second preset frequency to obtain a second radio frequency signal The first electric filter and the second electric filter are also connected to a controlled end of an IQ modulator, and the IQ modulator is also used to convert the first radio frequency signal With the second RF signal Coupled to the optical carrier On both sides of the sideband, two-frequency optical local oscillator signals are obtained The third electric filter is used to select the frequency of the sub-electrical signal according to the third preset frequency to obtain a third radio frequency signal The fourth electric filter is used to select the frequency of the sub-electrical signal according to the fourth preset frequency to obtain a fourth radio frequency signal The third electric filter and the fourth electric filter are also connected to the controlled end of another IQ modulator, and the other IQ modulator is also used to convert the third radio frequency signal With the fourth radio frequency signal Coupled to the optical carrier Wave On both sides of the sideband, two-frequency optical local oscillator signals are obtained
在一实施例中，IQ调制器包括第一IQ调制器和第二IQ调制器的情形下，射频配置模块包括功分器和两个电滤波器组；功分器与放大器连接，用于将放大的电信号进行功率分配；其中一个电滤波器组包括第一电滤波器和第二电滤波器，另一个电滤波器组132包括第三电滤波器和第四电滤波器，第一电滤波器、第二电滤波器以及第三电滤波器、第四电滤波器均与功分器连接。第一电滤波器用于根据第一预设频率对电信号进行频率选择，得到第一射频信号第二电滤波器用于根据第二预设频率对电信号进行频率选择，得到第二射频信号第一电滤波器、第二电滤波器还与一个IQ调制器的受控端连接，该IQ调制器还用于将第一射频信号与第二射频信号分别耦合至光载波的X偏振态上的边带两侧，得到X偏振态上的两频光本振信号 第三电滤波器用于根据第三预设频率对电信号进行频率选择，得到第三射频信号第四电滤波器用于根据第四预设频率对电信号进行频率选择，得到第四射频信号第三电滤波器、第四电滤波器还与另一个IQ调制器的受控端连接，另一个IQ调制器还用于将第三射频信号与第四射频信号分别耦合至光载波的Y偏振态上的边带两侧，得到Y偏振态上的两频光本振信号 In one embodiment, when the IQ modulator includes a first IQ modulator and a second IQ modulator, the RF configuration module includes a power divider and two electrical filter groups; the power divider is connected to the amplifier and is used to distribute the power of the amplified electrical signal; one of the electrical filter groups includes a first electrical filter and a second electrical filter, and the other electrical filter group 132 includes a third electrical filter and a fourth electrical filter, and the first electrical filter, the second electrical filter, the third electrical filter, and the fourth electrical filter are all connected to the power divider. The first electrical filter is used to select the frequency of the electrical signal according to the first preset frequency to obtain a first RF signal The second electric filter is used to select the frequency of the electric signal according to the second preset frequency to obtain a second radio frequency signal The first electric filter and the second electric filter are also connected to a controlled end of an IQ modulator, and the IQ modulator is also used to convert the first radio frequency signal With the second RF signal Coupled to the optical carrier On both sides of the sideband in the X polarization state, the two-frequency optical local oscillator signal in the X polarization state is obtained. The third electric filter is used to perform frequency selection on the electric signal according to the third preset frequency to obtain a third radio frequency signal The fourth electric filter is used to select the frequency of the electric signal according to the fourth preset frequency to obtain a fourth radio frequency signal The third electric filter and the fourth electric filter are also connected to the controlled end of another IQ modulator, and the other IQ modulator is also used to convert the third radio frequency signal With the fourth radio frequency signal Coupled to the optical carrier On both sides of the sideband on the Y polarization state, the two-frequency optical local oscillator signal on the Y polarization state is obtained.
需要说明的是，所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，上述描述的多频光本振生成方法的具体工作过程，可以参考前述图1至图7中的多频光本振生成装置实施例中的对应过程，在此不再赘述。It should be noted that, those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the multi-frequency optical local oscillator generation method described above can refer to the corresponding process in the embodiment of the multi-frequency optical local oscillator generation device in the aforementioned Figures 1 to 7, and will not be repeated here.
上述实施例提供的多频光本振生成方法，通过IQ调制器对激光源输出的光载波进行正交调制，得到调制光信号；通过光电转换模块将所述调制光信号转换为电信号；通过射频配置模块将电信号配置为多个预设频率的射频信号；通过IQ调制器将多个射频信号分别与所述光载波进行耦合，得到多频光本振信号。本申请实施例通过IQ调制器将多个预设频率的射频信号分别与光载波进行耦合，从而实现本振频率的边带复用，能够以高性价比的方式得到多频段的光本振信号，有效降低生成多频光本振的成本，并提高频谱利用率。The multi-frequency optical local oscillator generation method provided in the above embodiment is to orthogonally modulate the optical carrier output by the laser source through an IQ modulator to obtain a modulated optical signal; convert the modulated optical signal into an electrical signal through an optoelectronic conversion module; configure the electrical signal into a plurality of RF signals of preset frequencies through an RF configuration module; and couple the plurality of RF signals with the optical carrier respectively through an IQ modulator to obtain a multi-frequency optical local oscillator signal. The embodiment of the present application couples the RF signals of multiple preset frequencies with the optical carrier respectively through an IQ modulator, thereby realizing the sideband multiplexing of the local oscillator frequency, and can obtain multi-band optical local oscillator signals in a cost-effective manner, effectively reducing the cost of generating a multi-frequency optical local oscillator and improving the spectrum utilization.
请参阅图9，图9为本申请实施例提供的一种通信***的结构示意性框图。Please refer to FIG. 9 , which is a schematic block diagram of the structure of a communication system provided in an embodiment of the present application.
如图9所示，通信***300包括发射链路310、接收链路320以及多频光本振生成装置330，多频光本振生成装置330用于为发射链路310、接收链 路320提供多频光本振信号。其中，多频光本振生成装置330可以分别与发射链路310、接收链路320连接，以将多频光本振信号分别发送给发射链路310、接收链路320。多频光本振生成装置330可以为前述实施例中图1至图7的多频光本振生成装置100。As shown in FIG9 , the communication system 300 includes a transmission link 310, a receiving link 320, and a multi-frequency optical local oscillator generating device 330. The multi-frequency optical local oscillator generating device 330 is used to generate the transmission link 310 and the receiving link 320. The transmission link 310 and the receiving link 320 provide a multi-frequency optical local oscillator signal. The multi-frequency optical local oscillator generating device 330 can be connected to the transmission link 310 and the receiving link 320 respectively to send the multi-frequency optical local oscillator signal to the transmission link 310 and the receiving link 320 respectively. The multi-frequency optical local oscillator generating device 330 can be the multi-frequency optical local oscillator generating device 100 in Figures 1 to 7 of the aforementioned embodiments.
需要说明的是，在多频段微波光子通信过程中，发射链路310、接收链路320可以共用多频光本振生成装置330，从而能够方便快捷的实现多频段微波光子通信，即通过发射链路310向外发送多频段的射频信号，或者通过接收链路320接收多频段的目标基带数据信号。It should be noted that, in the process of multi-band microwave photonic communication, the transmitting link 310 and the receiving link 320 can share the multi-frequency optical local oscillator generating device 330, so that multi-band microwave photonic communication can be realized conveniently and quickly, that is, multi-band radio frequency signals are sent outwardly through the transmitting link 310, or multi-band target baseband data signals are received through the receiving link 320.
在一实施例中，如图10所示，发射链路310包括发射端IQ调制器311、第二滤波器组312和第一光电探测器组313；发射端IQ调制器311用于连接激光源10，还用于接收基带数据信号，以将基带数据信号调制于激光源10输出的光载波，得到基带调制信号；其中，多频光本振生成装置330提供的多频光本振信号用于与基带调制信号耦合，得到多频基带耦合信号；第二滤波器组312与发射端IQ调制器311、多频光本振生成装置330连接，第二滤波器组312用于对多频基带耦合信号进行滤波；第一光电探测器组313与第二滤波器组312连接，用于对滤波后的多频基带耦合信号进行外差处理，以输出多频段的射频信号Tx。In one embodiment, as shown in FIG10 , the transmission link 310 includes a transmitting end IQ modulator 311, a second filter group 312 and a first photodetector group 313; the transmitting end IQ modulator 311 is used to connect to the laser source 10, and is also used to receive a baseband data signal, so as to modulate the baseband data signal on the optical carrier output by the laser source 10 to obtain a baseband modulation signal; wherein the multi-frequency optical local oscillator signal provided by the multi-frequency optical local oscillator generating device 330 is used to couple with the baseband modulation signal to obtain a multi-frequency baseband coupled signal; the second filter group 312 is connected to the transmitting end IQ modulator 311 and the multi-frequency optical local oscillator generating device 330, and the second filter group 312 is used to filter the multi-frequency baseband coupled signal; the first photodetector group 313 is connected to the second filter group 312, and is used to perform heterodyne processing on the filtered multi-frequency baseband coupled signal to output a multi-band RF signal Tx.
在一实施例中，如图10和图11所示，发射链路310还包括第二偏振控制器3141和第三偏振分束器3142；第二偏振控制器3141的输出端与发射端IQ调制器311、多频光本振生成装置330连接，第二偏振控制器3141用于根据多频光本振生成装置330中第一偏振分束器1141或第二偏振分束器1242的偏振态角度对第三偏振分束器3142进行控制，以使第三偏振分束器3142与第一偏振分束器1141或第二偏振分束器1242的偏振态角度保持相同；第三偏振分束器3142与第二偏振控制器3141连接，第三偏振分束器3142用于将多频基带耦合信号进行偏振态信号分离，并将分离的多频基带耦合信号输入至第二滤波器组312。In one embodiment, as shown in Figures 10 and 11, the transmission link 310 also includes a second polarization controller 3141 and a third polarization beam splitter 3142; the output end of the second polarization controller 3141 is connected to the transmitting end IQ modulator 311 and the multi-frequency optical local oscillator generating device 330, and the second polarization controller 3141 is used to control the third polarization beam splitter 3142 according to the polarization state angle of the first polarization beam splitter 1141 or the second polarization beam splitter 1242 in the multi-frequency optical local oscillator generating device 330, so that the polarization state angle of the third polarization beam splitter 3142 remains the same as that of the first polarization beam splitter 1141 or the second polarization beam splitter 1242; the third polarization beam splitter 3142 is connected to the second polarization controller 3141, and the third polarization beam splitter 3142 is used to separate the polarization state signal of the multi-frequency baseband coupling signal, and input the separated multi-frequency baseband coupling signal into the second filter group 312.
示例性的，第二滤波器组312包括光滤波器3121、光滤波器3122、光滤波器3123和光滤波器3124，第一光电探测器组313包括光电探测器3131、光电探测器3132、光电探测器3133和光电探测器3134。光滤波器3121与光电探测器3131连接，光滤波器3121用于根据第一预设频率对分离的基带耦合信号进行滤波，光电探测器3131用于根据将滤波后的基带耦合信号转换为 光信号进行输出，得到射频信号光滤波器3122与光电探测器3132连接，光滤波器3122用于根据第二预设频率对分离的基带耦合信号进行滤波，光电探测器3132用于根据将滤波后的基带耦合信号转换为光信号进行输出，得到射频信号光滤波器3123与光电探测器3133连接，光滤波器3123用于根据第三预设频率对分离的基带耦合信号进行滤波，光电探测器3133用于根据将滤波后的基带耦合信号转换为光信号进行输出，得到射频信号光滤波器3124与光电探测器3134连接，光滤波器3124用于根据第四预设频率对分离的基带耦合信号进行滤波，光电探测器3134用于根据将滤波后的基带耦合信号转换为光信号进行输出，得到射频信号 Exemplarily, the second filter group 312 includes an optical filter 3121, an optical filter 3122, an optical filter 3123, and an optical filter 3124, and the first photodetector group 313 includes a photodetector 3131, a photodetector 3132, a photodetector 3133, and a photodetector 3134. The optical filter 3121 is connected to the photodetector 3131, the optical filter 3121 is used to filter the separated baseband coupling signal according to the first preset frequency, and the photodetector 3131 is used to convert the filtered baseband coupling signal into The optical signal is output to obtain the RF signal The optical filter 3122 is connected to the photodetector 3132. The optical filter 3122 is used to filter the separated baseband coupling signal according to the second preset frequency. The photodetector 3132 is used to convert the filtered baseband coupling signal into an optical signal for output to obtain a radio frequency signal. The optical filter 3123 is connected to the photodetector 3133. The optical filter 3123 is used to filter the separated baseband coupling signal according to the third preset frequency. The photodetector 3133 is used to convert the filtered baseband coupling signal into an optical signal for output to obtain a radio frequency signal. The optical filter 3124 is connected to the photodetector 3134, and the optical filter 3124 is used to filter the separated baseband coupling signal according to the fourth preset frequency, and the photodetector 3134 is used to convert the filtered baseband coupling signal into an optical signal for output to obtain a radio frequency signal.
需要说明的是，对于发射链路310，激光源产生的光载波通过一个发射端IQ调制器(MZM)调制上由数模转换器产生的基带数据信号，这个调制后的基带调制信号随后和多频光本振模块产生的光本振信号耦合到一起，传输到远端的偏振控制器中，通过调节偏振控制器实现X、Y两个正交偏振态在偏振分束器的两个输出端分离。对于X偏振态，输出的光信号包括两个X偏振态上的光本振(和)以及一个调制在光载波上的基带信号，经过两个光滤波器分别对左右边带滤波后，一个滤出信号光本振和光载波处的基带信号，另一个滤出信号光本振和光载波处的基带信号，这两个信号分别经过光电探测器的外差拍频后，就可以实现基带信号到两个中心频率为和的射频信号Tx的转换；同理，对于Y偏振态，输出的光信号包括两个Y偏振态上的光本振以及一个调制在光载波上的基带信号，随后被一分为二，每路经过一个光滤波器，一个滤出信号光本振和光载波处的基带信号，另一个滤出信号光本振和光载波处的基带信号，分别经过光电探测器的外差拍频后，就可以得到两个中心频率为和的射频信号Tx。由此，可以实现四个频段如 的频段发射。It should be noted that for the transmission link 310, the optical carrier generated by the laser source The baseband data signal generated by the digital-to-analog converter is modulated by a transmitter IQ modulator (MZM). The modulated baseband signal is then coupled with the optical local oscillator signal generated by the multi-frequency optical local oscillator module and transmitted to the remote polarization controller. The polarization controller is adjusted to separate the two orthogonal polarization states X and Y at the two output ends of the polarization beam splitter. For the X polarization state, the output optical signal includes the optical local oscillators ( and ) and a modulated optical carrier The baseband signal on the optical fiber is filtered by two optical filters for filtering the left and right sidebands respectively, and one filter out the signal optical local oscillator. and optical carrier The baseband signal at the other filter is the local oscillator of the signal light. and optical carrier The baseband signal at the center frequency can be realized by passing the heterodyne beat frequency of the photodetector to two baseband signals. and Similarly, for the Y polarization state, the output optical signal includes two optical local oscillators on the Y polarization state. and a modulated optical carrier The baseband signal on the optical fiber is then split into two, each passing through an optical filter, one filtering out the signal optical local oscillator. and optical carrier The baseband signal at the other filter is the local oscillator of the signal light. and optical carrier After the baseband signal at the photodetector passes through the heterodyne beat frequency, two center frequencies can be obtained. and Thus, four frequency bands can be realized such as frequency band for transmission.
在一实施例中，如图10所示，接收链路320包括接收端IQ调制器321、第三滤波器组322和第二光电探测器组323；接收端IQ调制器321用于连接激光源10，还用于接收天线接收到的多频段射频信号，以将多频段射频信号调制于激光源10输出的光载波，得到多频段射频调制信号；其中，多频光本振生成装置提供的多频光本振信号用于与多频段射频调制信号耦合，得到多频段射频耦合信号；第三滤波器组322与接收端IQ调制器321、多频光本振 生成装置连接，第三滤波器组322用于对多频段射频耦合信号进行滤波；第二光电探测器组323与第三滤波器组322连接，用于对滤波后的多频段射频耦合信号进行外差处理，得到多频段的目标基带数据信号。In one embodiment, as shown in FIG10 , the receiving link 320 includes a receiving-end IQ modulator 321, a third filter group 322, and a second photodetector group 323; the receiving-end IQ modulator 321 is used to connect to the laser source 10, and is also used to receive a multi-band RF signal received by an antenna, so as to modulate the multi-band RF signal on an optical carrier output by the laser source 10 to obtain a multi-band RF modulated signal; wherein the multi-band optical local oscillator signal provided by the multi-frequency optical local oscillator generating device is used to couple with the multi-band RF modulated signal to obtain a multi-band RF coupled signal; the third filter group 322 is connected to the receiving-end IQ modulator 321, the multi-frequency optical local oscillator The generating device is connected, and the third filter group 322 is used to filter the multi-band RF coupling signal; the second photodetector group 323 is connected to the third filter group 322, and is used to perform heterodyne processing on the filtered multi-band RF coupling signal to obtain a multi-band target baseband data signal.
在一实施例中，如图10和图11所示，接收链路320还包括第二光电探测器组3241和第四偏振分束器3242；第二光电探测器组3241的输出端与接收端IQ调制器321、多频光本振生成装置330连接，第二光电探测器组3241用于根据多频光本振生成装置330中第一偏振分束器1141或第二偏振分束器1242的偏振态角度对第四偏振分束器3242进行控制，以使第四偏振分束器3242与第一偏振分束器1141或第二偏振分束器1242的偏振态角度保持相同；第四偏振分束器3242与第二光电探测器组3241连接，第四偏振分束器3242用于将多频段射频耦合信号进行偏振态信号分离，并将分离的多频段射频耦合信号输入至第三滤波器组322。In one embodiment, as shown in Figures 10 and 11, the receiving link 320 also includes a second photodetector group 3241 and a fourth polarization beam splitter 3242; the output end of the second photodetector group 3241 is connected to the receiving end IQ modulator 321 and the multi-frequency optical local oscillator generating device 330, and the second photodetector group 3241 is used to control the fourth polarization beam splitter 3242 according to the polarization state angle of the first polarization beam splitter 1141 or the second polarization beam splitter 1242 in the multi-frequency optical local oscillator generating device 330, so that the polarization state angle of the fourth polarization beam splitter 3242 remains the same as that of the first polarization beam splitter 1141 or the second polarization beam splitter 1242; the fourth polarization beam splitter 3242 is connected to the second photodetector group 3241, and the fourth polarization beam splitter 3242 is used to separate the polarization state signal of the multi-band RF coupling signal, and input the separated multi-band RF coupling signal into the third filter group 322.
示例性的，第三滤波器组322包括光滤波器3221、光滤波器3222、光滤波器3223和光滤波器3224，第二光电探测器组323包括光电探测器3231、光电探测器3232、光电探测器3233和光电探测器3234。光滤波器3221与光电探测器3231连接，光滤波器3221用于根据第一预设频率对分离的基带耦合信号进行滤波，光电探测器3231用于根据将滤波后的基带耦合信号转换为光信号进行输出，得到射频信号光滤波器3222与光电探测器3232连接，光滤波器3222用于根据第二预设频率对分离的基带耦合信号进行滤波，光电探测器3232用于根据将滤波后的基带耦合信号转换为光信号进行输出，得到射频信号光滤波器3223与光电探测器3233连接，光滤波器3223用于根据第三预设频率对分离的基带耦合信号进行滤波，光电探测器3233用于根据将滤波后的基带耦合信号转换为光信号进行输出，得到射频信号光滤波器3224与光电探测器3234连接，光滤波器3224用于根据第四预设频率对分离的基带耦合信号进行滤波，光电探测器3234用于根据将滤波后的基带耦合信号转换为光信号进行输出，得到射频信号 Exemplarily, the third filter group 322 includes an optical filter 3221, an optical filter 3222, an optical filter 3223, and an optical filter 3224, and the second photodetector group 323 includes a photodetector 3231, a photodetector 3232, a photodetector 3233, and a photodetector 3234. The optical filter 3221 is connected to the photodetector 3231, the optical filter 3221 is used to filter the separated baseband coupling signal according to the first preset frequency, and the photodetector 3231 is used to convert the filtered baseband coupling signal into an optical signal for output to obtain a radio frequency signal. The optical filter 3222 is connected to the photodetector 3232. The optical filter 3222 is used to filter the separated baseband coupling signal according to the second preset frequency. The photodetector 3232 is used to convert the filtered baseband coupling signal into an optical signal for output to obtain a radio frequency signal. The optical filter 3223 is connected to the photodetector 3233, and the optical filter 3223 is used to filter the separated baseband coupling signal according to the third preset frequency, and the photodetector 3233 is used to convert the filtered baseband coupling signal into an optical signal for output to obtain a radio frequency signal. The optical filter 3224 is connected to the photodetector 3234, and the optical filter 3224 is used to filter the separated baseband coupling signal according to the fourth preset frequency, and the photodetector 3234 is used to convert the filtered baseband coupling signal into an optical signal for output to obtain a radio frequency signal.
需要说明的是，对于下路的接收链路320，激光源产生的光载波首先通过一个接收端IQ调制器(MZM)调制上天线Rx接收到的多频段射频信号(中心载频分别为)，并使接收端IQ调制器工作在载波抑制双边带调制模式上，这样在光载波左右两侧均有多波段射频调制信号，左侧光载多波段射频调制信号的中心载频可以表示为： 右侧光载多波段射频调制信号的中心载频可以表示为： 随后，这个光载多波段射频调制信号与多频光本振模块产生的光本振信号耦合到一起，送入到偏振控制器中，并经过偏振分束器实现X、Y两个正交偏振态的分离。对于X偏振态，输出的光信号包括两个X偏振态上的光本振信号(和)以及一个调制在光载波左右两侧上的多频段射频信号，经过两个光滤波器分别对左右边带滤波后，一个滤出信号光本振和光载波左侧处于中心载频为的射频调制信号，另一个滤出信号光本振和光载波右侧处于中心载频为的射频调制信号，这两个信号分别经过光电探测器的外差拍频后，就可以实现两个射频信号到基带信号的转换；对于Y偏振态上接收处理，与X偏振态原理一样，此处不再赘述，其输出的光本振信号如 It should be noted that for the downlink receiving link 320, the optical carrier generated by the laser source First, a receiving-end IQ modulator (MZM) modulates the multi-band RF signal (center carrier frequencies are ), and the receiving end IQ modulator works in the carrier suppressed double sideband modulation mode, so that there are multi-band RF modulation signals on both sides of the optical carrier. The center carrier frequency of the multi-band RF modulation signal on the left optical carrier can be expressed as: The center carrier frequency of the optical multi-band RF modulated signal on the right can be expressed as: Subsequently, the optical multi-band RF modulated signal is coupled with the optical local oscillator signal generated by the multi-frequency optical local oscillator module, sent to the polarization controller, and separated into two orthogonal polarization states X and Y through the polarization beam splitter. For the X polarization state, the output optical signal includes the optical local oscillator signals on the two X polarization states ( and ) and a modulated optical carrier The multi-band RF signals on the left and right sides are filtered by two optical filters respectively, and one filter out the signal optical local oscillator The left side of the optical carrier is at the center carrier frequency The RF modulated signal and the other one filters out the signal optical local oscillator The right side of the optical carrier is at the center carrier frequency. The two signals are respectively subjected to the heterodyne beat frequency of the photodetector, and the conversion of the two RF signals to baseband signals can be realized; for the reception processing in the Y polarization state, the principle is the same as that in the X polarization state, and will not be repeated here. The output optical local oscillator signal is as follows
综上，可以利用所提出的发射链路310、接收链路320以及多频光本振信号生成装置330，同时实现如四个不同载频信号的发射与接收。可以看到，本申请提出的通信***结构简单，各波段频率可独立调节，灵活性高，可实施性强。In summary, the proposed transmission link 310, reception link 320 and multi-frequency optical local oscillator signal generating device 330 can be used to simultaneously realize the transmission and reception of four different carrier frequency signals. It can be seen that the communication system proposed in this application has a simple structure, each band frequency can be adjusted independently, has high flexibility and strong feasibility.
需要说明的是，所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，上述描述的通信***的具体工作过程，可以参考前述图1至图7中多频光本振生成装置实施例中的对应过程，在此不再赘述。It should be noted that technicians in the relevant field can clearly understand that for the convenience and simplicity of description, the specific working process of the communication system described above can refer to the corresponding process in the embodiments of the multi-frequency optical local oscillator generating device in Figures 1 to 7 above, and will not be repeated here.
本领域普通技术人员可以理解，上文中所公开方法中的全部或某些步骤、***、装置中的功能模块/单元可以被实施为软件、固件、硬件及其适当的组合。在硬件实施方式中，在以上描述中提及的功能模块/单元之间的划分不一定对应于物理组件的划分；例如，一个物理组件可以具有多个功能，或者一个功能或步骤可以由若干物理组件合作执行。某些物理组件或所有物理组件可以被实施为由处理器，如中央处理器、数字信号处理器或微处理器执行的软件，或者被实施为硬件，或者被实施为集成电路，如专用集成电路。此外，本领域普通技术人员公知的是，通信介质通常包含计算机可读指令、数据结构、程序模块或者诸如载波或其他传输机制之类的调制数据信号中的其他数据，并且可包括任何信息递送介质。It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules/units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application-specific integrated circuit. In addition, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and may include any information delivery medium.
上述本申请实施例序号仅仅为了描述，不代表实施例的优劣。以上仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到各种等效的修改 或替换，这些修改或替换都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以权利要求的保护范围为准。 The serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications within the technical scope disclosed in the present application. These modifications or replacements should be included in the protection scope of this application. Therefore, the protection scope of this application should be based on the protection scope of the claims.

Claims (15)

  1. 一种多频光本振生成装置，包括：A multi-frequency optical local oscillator generating device, comprising:
    载波调制模块，包括同相正交IQ调制器，所述IQ调制器用于连接激光源，以对所述激光源输出的光载波进行正交调制，得到调制光信号；The carrier modulation module includes an in-phase orthogonal IQ modulator, wherein the IQ modulator is used to connect to a laser source to perform orthogonal modulation on an optical carrier output by the laser source to obtain a modulated optical signal;
    光电转换模块，与所述载波调制模块连接，用于将所述调制光信号转换为电信号；An optoelectronic conversion module, connected to the carrier modulation module, and configured to convert the modulated optical signal into an electrical signal;
    射频配置模块，与所述光电转换模块连接，用于将所述电信号配置为多个预设频率的射频信号；A radio frequency configuration module, connected to the photoelectric conversion module, configured to configure the electrical signal into radio frequency signals of multiple preset frequencies;
    其中，所述IQ调制器还连接于所述射频配置模块，所述IQ调制器还用于将多个所述射频信号分别与所述光载波进行耦合，得到多频光本振信号。The IQ modulator is also connected to the radio frequency configuration module, and is further used to couple the plurality of radio frequency signals with the optical carrier respectively to obtain a multi-frequency optical local oscillator signal.
  2. 根据权利要求1所述的多频光本振生成装置，其中，所述载波调制模块还包括单模光纤；所述单模光纤与所述IQ调制器连接，用于对所述IQ调制器输出的调制光信号进行延时。According to the multi-frequency optical local oscillator generating device according to claim 1, wherein the carrier modulation module further comprises a single-mode optical fiber; the single-mode optical fiber is connected to the IQ modulator and is used to delay the modulated optical signal output by the IQ modulator.
  3. 根据权利要求1所述的多频光本振生成装置，其中，所述IQ调制器为多个，所述载波调制模块还包括耦合器；The multi-frequency optical local oscillator generating device according to claim 1, wherein the IQ modulator is multiple, and the carrier modulation module further includes a coupler;
    所述耦合器与多个所述IQ调制器连接，用于将多个所述IQ调制器输出的调制光信号进行耦合。The coupler is connected to the multiple IQ modulators and is used to couple the modulated optical signals output by the multiple IQ modulators.
  4. 根据权利要求3所述的多频光本振生成装置，其中，所述光电转换模块包括分束器、多个光电探测器和多个放大器；The multi-frequency optical local oscillator generating device according to claim 3, wherein the photoelectric conversion module comprises a beam splitter, a plurality of photodetectors and a plurality of amplifiers;
    所述分束器与所述耦合器连接，用于将耦合的所述调制光信号分为多个子调制光信号，并将所述多个子调制光信号分别输出至所述多个光电探测器；The beam splitter is connected to the coupler, and is used to split the coupled modulated optical signal into a plurality of sub-modulated optical signals, and output the plurality of sub-modulated optical signals to the plurality of photodetectors respectively;
    各所述光电探测器与所述分束器连接，所述光电探测器用于将所述子调制光信号转换为子电信号；Each of the photodetectors is connected to the beam splitter, and the photodetector is used to convert the sub-modulated optical signal into a sub-electrical signal;
    各所述放大器与多个所述光电探测器一一对应连接，所述放大器用于 放大所述子电信号；Each of the amplifiers is connected to a plurality of the photodetectors in a one-to-one correspondence, and the amplifiers are used to amplifying the sub-electrical signal;
    各所述放大器还与多个所述射频配置模块一一对应连接，所述射频配置模块用于将放大的所述子电信号配置为预设频率的射频信号。Each of the amplifiers is also connected to a plurality of the radio frequency configuration modules in a one-to-one correspondence, and the radio frequency configuration module is used to configure the amplified sub-electrical signal into a radio frequency signal of a preset frequency.
  5. 根据权利要求1所述的多频光本振生成装置，其中，所述IQ调制器包括第一IQ调制器和第二IQ调制器，所述载波调制模块还包括第一偏振分束器和第一偏振合束器；The multi-frequency optical local oscillator generating device according to claim 1, wherein the IQ modulator comprises a first IQ modulator and a second IQ modulator, and the carrier modulation module further comprises a first polarization beam splitter and a first polarization beam combiner;
    所述第一偏振分束器与所述激光源连接，用于将所述光载波分为第一偏振态信号和第二偏振态信号；The first polarization beam splitter is connected to the laser source and is used to split the optical carrier into a first polarization state signal and a second polarization state signal;
    所述第一IQ调制器与所述第一偏振分束器连接，用于将所述第一偏振态信号进行正交调制，得到第一调制光信号；The first IQ modulator is connected to the first polarization beam splitter, and is used to orthogonally modulate the first polarization state signal to obtain a first modulated optical signal;
    所述第二IQ调制器与所述第一偏振分束器连接，用于将所述第二偏振态信号进行正交调制，得到第二调制光信号；The second IQ modulator is connected to the first polarization beam splitter, and is used to orthogonally modulate the second polarization state signal to obtain a second modulated optical signal;
    所述偏振合束器与所述第一IQ调制器、第二IQ调制器连接，用于合束所述第一调制光信号和所述第二调制光信号，得到所述调制光信号。The polarization beam combiner is connected to the first IQ modulator and the second IQ modulator, and is used to combine the first modulated optical signal and the second modulated optical signal to obtain the modulated optical signal.
  6. 根据权利要求5所述的多频光本振生成装置，其中，所述光电转换模块包括第一偏振控制器、第二偏振分束器、第一光电转换单元和第二光电转换单元；The multi-frequency optical local oscillator generating device according to claim 5, wherein the photoelectric conversion module comprises a first polarization controller, a second polarization beam splitter, a first photoelectric conversion unit, and a second photoelectric conversion unit;
    所述第一偏振控制器与所述第一偏振合束器连接，所述第一偏振控制器用于根据所述第一偏振分束器的偏振态角度对所述第二偏振分束器进行控制，以使所述第二偏振分束器与所述第一偏振分束器的偏振态角度保持相同；The first polarization controller is connected to the first polarization beam combiner, and the first polarization controller is used to control the second polarization beam splitter according to the polarization state angle of the first polarization beam splitter, so that the polarization state angle of the second polarization beam splitter and the first polarization beam splitter remain the same;
    所述第二偏振分束器与所述第一偏振控制器连接，所述第二偏振分束器用于将所述调制光信号分为第三偏振态信号和第四偏振态信号；The second polarization beam splitter is connected to the first polarization controller, and the second polarization beam splitter is used to split the modulated optical signal into a third polarization state signal and a fourth polarization state signal;
    所述第一光电转换单元、所述第二光电转换单元与所述第二偏振分束器连接，所述第一光电转换单元用于将所述第三偏振态信号转换为第一电信号，所述第二光电转换单元用于将所述第四偏振态信号转换为第二电信 号；The first photoelectric conversion unit and the second photoelectric conversion unit are connected to the second polarization beam splitter, the first photoelectric conversion unit is used to convert the third polarization state signal into a first electrical signal, and the second photoelectric conversion unit is used to convert the fourth polarization state signal into a second electrical signal. Number;
    所述第一光电转换单元、所述第二光电转换单元还与所述射频配置模块连接，所述射频配置模块用于将所述第一电信号、第二电信号分别配置为两个预设频率的射频信号。The first photoelectric conversion unit and the second photoelectric conversion unit are also connected to the radio frequency configuration module, and the radio frequency configuration module is used to configure the first electrical signal and the second electrical signal into two radio frequency signals of preset frequencies respectively.
  7. 根据权利要求1所述的多频光本振生成装置，其中，所述光电转换模块包括光电探测器和放大器；The multi-frequency optical local oscillator generating device according to claim 1, wherein the photoelectric conversion module comprises a photodetector and an amplifier;
    所述光电探测器与所述载波调制模块连接，用于将所述调制光信号转换为电信号；The photoelectric detector is connected to the carrier modulation module and is used to convert the modulated optical signal into an electrical signal;
    所述放大器与所述光电探测器连接，用于放大所述电信号。The amplifier is connected to the photodetector and is used to amplify the electrical signal.
  8. 根据权利要求1-7任一项所述的多频光本振生成装置，其中，所述射频配置模块包括功分器和第一滤波器组；The multi-frequency optical local oscillator generating device according to any one of claims 1 to 7, wherein the radio frequency configuration module comprises a power divider and a first filter group;
    所述功分器与所述光电转换模块连接，用于将所述电信号进行功率分配；The power divider is connected to the photoelectric conversion module and is used to distribute the power of the electrical signal;
    所述第一滤波器组与所述功分器连接，用于对所述电信号进行频率选择，得到多个预设频率的射频信号。The first filter group is connected to the power divider and is used to perform frequency selection on the electrical signal to obtain radio frequency signals of multiple preset frequencies.
  9. 根据权利要求8所述的多频光本振生成装置，其中，所述第一滤波器组包括第一电滤波器和第二电滤波器，所述第一电滤波器、所述第二电滤波器与所述功分器连接；The multi-frequency optical local oscillator generating device according to claim 8, wherein the first filter group comprises a first electric filter and a second electric filter, and the first electric filter and the second electric filter are connected to the power divider;
    所述第一电滤波器用于根据第一预设频率对所述电信号进行频率选择，得到第一射频信号；所述第二电滤波器用于根据第二预设频率对所述电信号进行频率选择，得到第二射频信号；The first electric filter is used to perform frequency selection on the electric signal according to a first preset frequency to obtain a first radio frequency signal; the second electric filter is used to perform frequency selection on the electric signal according to a second preset frequency to obtain a second radio frequency signal;
    所述第一电滤波器、所述第二电滤波器还与所述IQ调制器的受控端连接，所述IQ调制器还用于将所述第一射频信号与所述第二射频信号分别耦合至所述光载波的边带两侧，得到两频光本振信号。The first electrical filter and the second electrical filter are also connected to the controlled end of the IQ modulator, and the IQ modulator is also used to couple the first radio frequency signal and the second radio frequency signal to both sides of the sideband of the optical carrier respectively to obtain a two-frequency optical local oscillator signal.
  10. 一种多频光本振生成方法，应用于多频光本振生成装置，所述多频光本振生成装置包括载波调制模块、光电转换模块和射频配置模块；其 中，所述载波调制模块包括同相正交IQ调制器，所述IQ调制器用于连接激光源；所述光电转换模块与所述载波调制模块连接，所述射频配置模块与所述光电转换模块连接，所述IQ调制器还连接于所述射频配置模块；所述方法包括：A multi-frequency optical local oscillator generation method is applied to a multi-frequency optical local oscillator generation device, wherein the multi-frequency optical local oscillator generation device includes a carrier modulation module, an optoelectronic conversion module and a radio frequency configuration module; In the method, the carrier modulation module includes an in-phase orthogonal IQ modulator, and the IQ modulator is used to connect to a laser source; the photoelectric conversion module is connected to the carrier modulation module, the radio frequency configuration module is connected to the photoelectric conversion module, and the IQ modulator is also connected to the radio frequency configuration module; the method includes:
    通过所述IQ调制器对所述激光源输出的光载波进行正交调制，得到调制光信号；Performing orthogonal modulation on the optical carrier output by the laser source through the IQ modulator to obtain a modulated optical signal;
    通过所述光电转换模块将所述调制光信号转换为电信号；Converting the modulated optical signal into an electrical signal by the photoelectric conversion module;
    通过所述射频配置模块将所述电信号配置为多个预设频率的射频信号；The electrical signal is configured into a plurality of radio frequency signals of preset frequencies by the radio frequency configuration module;
    通过所述IQ调制器将多个所述射频信号分别与所述光载波进行耦合，得到多频光本振信号。The multiple radio frequency signals are coupled to the optical carrier respectively through the IQ modulator to obtain a multi-frequency optical local oscillator signal.
  11. 一种通信***，包括：A communication system, comprising:
    发射链路和接收链路；以及a transmit chain and a receive chain; and
    如权利要求1至9中任一项所述的多频光本振生成装置，用于为所述发射链路、所述接收链路提供多频光本振信号。The multi-frequency optical local oscillator generating device according to any one of claims 1 to 9, used to provide multi-frequency optical local oscillator signals for the transmitting link and the receiving link.
  12. 根据权利要求11所述的通信***，其中，所述发射链路包括发射端IQ调制器、第二滤波器组和第一光电探测器组；The communication system according to claim 11, wherein the transmission chain comprises a transmitting-end IQ modulator, a second filter group, and a first photodetector group;
    所述发射端IQ调制器用于连接激光源，还用于接收基带数据信号，以将所述基带数据信号调制于所述激光源输出的光载波，得到基带调制信号；其中，所述多频光本振生成装置提供的多频光本振信号用于与所述基带调制信号耦合，得到多频基带耦合信号；The transmitting end IQ modulator is used to connect to the laser source and is also used to receive a baseband data signal to modulate the baseband data signal on the optical carrier output by the laser source to obtain a baseband modulation signal; wherein the multi-frequency optical local oscillator signal provided by the multi-frequency optical local oscillator generating device is used to couple with the baseband modulation signal to obtain a multi-frequency baseband coupling signal;
    所述第二滤波器组与所述发射端IQ调制器、所述多频光本振生成装置连接，所述第二滤波器组用于对所述多频基带耦合信号进行滤波；The second filter group is connected to the transmitting end IQ modulator and the multi-frequency optical local oscillator generating device, and the second filter group is used to filter the multi-frequency baseband coupling signal;
    所述第一光电探测器组与所述第二滤波器组连接，用于对滤波后的所述多频基带耦合信号进行外差处理，以输出多频段的射频信号。The first photodetector group is connected to the second filter group and is used to perform heterodyne processing on the filtered multi-frequency baseband coupling signal to output a multi-band radio frequency signal.
  13. 根据权利要求12所述的通信***，其中，所述发射链路还包括 第二偏振控制器和第三偏振分束器；The communication system according to claim 12, wherein the transmission chain further comprises a second polarization controller and a third polarization beam splitter;
    所述第二偏振控制器的输出端与所述发射端IQ调制器、所述多频光本振生成装置连接，所述第二偏振控制器用于根据所述多频光本振生成装置中第一偏振分束器或第二偏振分束器的偏振态角度对所述第三偏振分束器进行控制，以使所述第三偏振分束器与所述第一偏振分束器或第二偏振分束器的偏振态角度保持相同；The output end of the second polarization controller is connected to the transmitting end IQ modulator and the multi-frequency optical local oscillator generating device, and the second polarization controller is used to control the third polarization beam splitter according to the polarization state angle of the first polarization beam splitter or the second polarization beam splitter in the multi-frequency optical local oscillator generating device, so that the polarization state angle of the third polarization beam splitter and the first polarization beam splitter or the second polarization beam splitter remain the same;
    所述第三偏振分束器与所述第二偏振控制器连接，所述第三偏振分束器用于将所述多频基带耦合信号进行偏振态信号分离，并将分离的所述多频基带耦合信号输入至所述第二滤波器组。The third polarization beam splitter is connected to the second polarization controller, and is used for performing polarization state signal separation on the multi-frequency baseband coupling signal, and inputting the separated multi-frequency baseband coupling signal into the second filter group.
  14. 根据权利要求11所述的通信***，其中，所述接收链路包括接收端IQ调制器、第三滤波器组和第二光电探测器组；The communication system according to claim 11, wherein the receiving chain comprises a receiving-end IQ modulator, a third filter group, and a second photodetector group;
    所述接收端IQ调制器用于连接激光源，还用于接收天线接收到的多频段射频信号，以将所述多频段射频信号调制于所述激光源输出的光载波，得到多频段射频调制信号；其中，所述多频光本振生成装置提供的多频光本振信号用于与所述多频段射频调制信号耦合，得到多频段射频耦合信号；The receiving end IQ modulator is used to connect to the laser source, and is also used to receive the multi-band radio frequency signal received by the antenna, so as to modulate the multi-band radio frequency signal on the optical carrier output by the laser source to obtain a multi-band radio frequency modulated signal; wherein the multi-frequency optical local oscillator signal provided by the multi-frequency optical local oscillator generating device is used to couple with the multi-band radio frequency modulated signal to obtain a multi-band radio frequency coupled signal;
    所述第三滤波器组与所述接收端IQ调制器、所述多频光本振生成装置连接，所述第三滤波器组用于对所述多频段射频耦合信号进行滤波；The third filter group is connected to the receiving end IQ modulator and the multi-frequency optical local oscillator generating device, and the third filter group is used to filter the multi-band RF coupling signal;
    所述第二光电探测器组与所述第三滤波器组连接，用于对滤波后的所述多频段射频耦合信号进行外差处理，得到多频段的目标基带数据信号。The second photodetector group is connected to the third filter group and is used to perform heterodyne processing on the filtered multi-band RF coupling signal to obtain a multi-band target baseband data signal.
  15. 根据权利要求14所述的通信***，其中，所述接收链路还包括第三偏振控制器和第四偏振分束器；The communication system according to claim 14, wherein the receiving link further comprises a third polarization controller and a fourth polarization beam splitter;
    所述第三偏振控制器的输出端与所述接收端IQ调制器、所述多频光本振生成装置连接，所述第三偏振控制器用于根据所述多频光本振生成装置中第一偏振分束器或第二偏振分束器的偏振态角度对所述第四偏振分束器进行控制，以使所述第四偏振分束器与所述第一偏振分束器或第二偏振分束器的偏振态角度保持相同； The output end of the third polarization controller is connected to the receiving end IQ modulator and the multi-frequency optical local oscillator generating device, and the third polarization controller is used to control the fourth polarization beam splitter according to the polarization state angle of the first polarization beam splitter or the second polarization beam splitter in the multi-frequency optical local oscillator generating device, so that the polarization state angle of the fourth polarization beam splitter remains the same as that of the first polarization beam splitter or the second polarization beam splitter;
    所述第四偏振分束器与所述第三偏振控制器连接，所述第四偏振分束器用于将所述多频段射频耦合信号进行偏振态信号分离，并将分离的所述多频段射频耦合信号输入至所述第三滤波器组。 The fourth polarization beam splitter is connected to the third polarization controller, and is used for performing polarization state signal separation on the multi-band RF coupling signal, and inputting the separated multi-band RF coupling signal into the third filter group.
PCT/CN2023/106971 2022-12-21 2023-07-12 Multi-frequency optical local oscillator generation apparatus and method, and communication system WO2024131038A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105721062A (en) * 2016-03-01 2016-06-29 中国电子科技集团公司第五十四研究所 Low stray bandwidth microwave photon mixing device
WO2021259011A1 (en) * 2020-06-24 2021-12-30 清华大学 Radar signal processing method, system and apparatus based on photonic fractional fourier transformer
CN114448511A (en) * 2020-11-03 2022-05-06 北京华航无线电测量研究所 Reconfigurable multiband microwave photon transceiving link
CN114614903A (en) * 2022-03-29 2022-06-10 中国科学院半导体研究所 Photon signal generator and generation method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105721062A (en) * 2016-03-01 2016-06-29 中国电子科技集团公司第五十四研究所 Low stray bandwidth microwave photon mixing device
WO2021259011A1 (en) * 2020-06-24 2021-12-30 清华大学 Radar signal processing method, system and apparatus based on photonic fractional fourier transformer
CN114448511A (en) * 2020-11-03 2022-05-06 北京华航无线电测量研究所 Reconfigurable multiband microwave photon transceiving link
CN114614903A (en) * 2022-03-29 2022-06-10 中国科学院半导体研究所 Photon signal generator and generation method

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